Investigation on the interface modification of PET/PP composites


Field electron emission characteristics of plasma treated carbon nanotubes


Influence of Self-assembly Conditions on Film Formation, Optical and Electrical Properties of Gold Nanoparticle Network Film

金ナノ粒子ネットワーク膜の形成と光学的・電気的特性に及ぼす自己集積化条件の影響

Gold nanoparticles were grown under various sodium citrate concentration and self-assembled gold nanoparticle films were formed on a glass substrate under various conditions to examine the effect of sodium citrate concentration on the particle size of gold nanoparticles and the effect of processing time and processing temperature on the optical properties and electrical resistivity of the self-assembled gold nanoparticle film. As a result, it was found that the ratio of tetrachloroauric (III) acid to sodium citrate is preferably 1:3 was appropriate to obtain fine gold nanoparticles. The self-assembled gold nanoparticle films showed a network structure formed by nano-wires for all assembled conditions. However the thickness or the assembled state of the gold nano-wires was sensitive to the processing temperature whereas the processing time hardly affected the properties of the nano-wires. In particular, higher processing temperature led to a break in the nano-wires and then the optical properties and electrical resistivity was degraded.

Journal of the Society of Materials Science, Japan


Noise Measurement and Analysis of Field Emission Current from Boron Doped Diamond


Dependence of Sputtering Times on the Structural and Electrical Properties of ZnO/Ag/ZnO Thin Films on PET by DC Sputtering


Comparison of Mechanical Properties between Carbon/PEEK Composites and Ti Stem for Optimal Design

International Journal of Ocean System Engineering


Friction and Wear Behavior of Carbon/PEEK Composites according to Sliding Velocity


Tribological Properties of Carbon/PEEK Composites


Photoluminescence modulation of ZnO via coupling with the surface plasmon resonance of gold nanoparticles


Modeling the hot deformation behavior of Al alloy 3003


Experimental and numerical investigation for ductile fracture of Al-alloy 5052 using modified Rousselier model


Study on the fatigue properties of plasma nitriding S45C with a pre-ultrasonic nanocrystal surface modification process


Improvement of the fatigue strength of SUS304 austenite stainless steel using ultrasonic nanocrystal surface modification

An ultrasonic nanocrystal surfacemodi cation (UNSM) treatmentwas applied to improve the fatigue strength of typical SUS304 austenite stainless steel. A gradient nanocrystalline plastic deformation layer with increased hardness was created at the specimen surface after UNSM treatment. The average grain size at the top surface was re ned to a few nanometers, and the whole thickness of the plastic deformation layer was ~30 to 200 μm, depending on the various treatment conditions. The hardened surface layer was assumed to be the main reason for the improvement in the fatigue strength. The increase in the fatigue strengthwas related to theUNSMapplied static loads. In this work, it was found that a static load of 90 N was optimum to obtain a large cycle fatigue strength limit. Plastic deformation (strain)-induced martensitic transformations were also observed in the surface layer. The mechanism for further grain re nement based on martensitic transformations is discussed.


Desing of Artificial Hip Joint by Carbon/PEEK Compsites


Effect of Moisture Absorption and Fiber Ply Orientation for Artificial Hip Joint on the Mechanical Properties of Carbon/PEEK Composites


Mechanical Properties of Carbon/PEEK Composites According to the Fiber Ply Orientation and Sizing Removing of Carbon Fiber for Artificial Hip Joint


Effect of ultrasonic nanocrystal surface modification on the fatigue behaviors of plasma-nitrided S45C steel


Effect of Film Thickness on Electrical and Optical Properties of ZnO/Ag Dual Layer Film


Wetting Properties of Silicon Incorporated DLC Films on Aluminum Substrate


A Study on Experimets and Simulations for Ductile Fracture of Isotropic Material Using Rousselier's Damage Model

International Journal of Modern Physics: Conference Series


An Investigation of Fatigue Properties of Pre-Quenched -Tempered S45C Steel with Plasma Nitriding Treatment


Simulation of Ductile Fracture in an Aluminum Alloy Using Various Critera


Adhesive Behaviors of the Aluminum Alloy-Based CrN and TiN Coating Films for Ocean Plant

International Journal of Ocean System Engineering


Fatigue Crack Growth Behavior of Stainless Steel Coated with TiN Film


Evaluation of thermo oxidative degradation behavior of gasket rubber sheet deposited with SiOxNy gas barrier films


Influence of surface free energy on adhesion of CrN thin film deposited by AIP Method


Influence of Heat Treatment Condition on Photocatalytic Properties of Oxidized TiN Film


Influence of Carbon content on Fatigue Strength of Drawn Steel Tubes for Small Once through Boiler


Organization of cubic CeO2 nanoparticles on the edges of self assembled tapered ZnO nanorods via a template free one-pot synthesis: significantcathodoluminescence and field emission properties


The Optical and Electrical Properties of ZnO/Ag/ZnO Films on Flexible Substrate


Fatigue Properties of SUS304 Stainless Steel After Ultrasonic Nanocrystal Surface Modification(UNSM)


Comparison of the mechanical performance of cutting tools coated by either a TiCxN1-x single-layer of a TiC/TiC0.5N0.5/TiN multilayer using the hollow cathode discharge ion plating method


Fatigue Behavior of Plasma Radical Nitrided SCM435 Steel in Super-Long Life Regime


A Study on the Physical Properties of AZO Films as Variation of Sputtering Conditions


Influence of Heat Treatment on Fatigue Strength of Drawn Steel Tubes for Small-sized Single Pass Boiler


Effect of silver evolution on conductivity and transmittance of ZnO/Ag thin films


Promising Field Emission Characteristics of Polyaniline Nanotubes


Influence of High-Energy Electron Irradiation on Field Emission Properties of Multi-Walled Carbon Nanotubes (MWCNTs) Films


Corrosion behavior of die-cast AZ91D magnesium alloys in sodium sulphate solutions with different pH values

Transactions of Nonferrous Metals Society of China


Influence of Particle Size on Anti-Adhesion Effect of Surface Polished Steel Plate

表面研磨処理を施した鋼板の粉体付着抑制効果に及ぼす粒子径の影響

In this paper, we examined the influence of particle size on anti-adhesion effect of a surface polished steel plate. SiO2 spherical powders and stainless steel plates with seven kinds of surface roughness were used for the investigation. The adhesion tests of SiO2 powders to the polished stainless steel plates were performed using powders of nominal size 9 and 13μm. In the case of 13μm powder, the obvious adhesion and deposition of powder was not observed for all steel surface conditions. However, strong adhesion of particles and thin deposition layers were observed for 9μm powder, being independent of surface roughness of the steel plates. The size of adhered particles on the steel plate were measured by SEM observations in order to examine the adhesion mechanism of SiO2 particle to the polished stainless plate substrate. As a result, adhesion of 3-5 μm particles to the steel surface was largely independent of surface roughness. The adhesion of 3-5 μm particles can be avoided by mixing of small particles of 0.5μm powder into 9μm powder.

Transactions of The Japan Society of Mechanical Engineers, Series C

日本機械学会論文集(C編)


A computational analysis of the scarf angle on a composites repair

International Journal of Ocean System Engineering


First-principles simulation and experimental evidence for improvement of transmittance in ZnO films

Progress in Natural Science : Materials International


Enhanced field emission characteristics of boron doped diamond films grown by microwave plasma assisted chemical vapor deposition


Surface Plasmon Resonant Enhanced Optical Transmission through ZnO/Ag/ZnO Multilayered Films

Advances in Materials Science for Environmental and Nuclear Technology


Response to Comment on Enhancement of light transmission by coupling to surface plasmon polaritons of a layer-plus-islands silver layer [ J. Appl. Phys. 106, 103104 (2009) ]


Influence of film structure on gas barrier properties of SiOxNy films


Improved microstructure and magnetic properties of ironcobalt nanowire via an ac electrodeposition with a multistep voltage


Fatigue properties of a S45C steel subjected to ultrasonic nanocrystal surface modification


Influence of Surface Polishing of Steel Plate on Adhesion/Heap Behaviour of Silica Powder

シリカ粉体の付着・堆積挙動に及ぼす鋼板表面研磨処理の影響

In this paper, we examined the relationship between surface roughness and particle adhesion behavior by a proposed experiment. Five kinds of SiO_2 spherical powders (powder diameter: 0.2, 0.5, 1.0, 1.5 and 2.0μm) and stainless steel plates with seven kinds of surface roughness were used for the invetigation. The effect of humidity, electrostatic force and van der Waals force on the particle-steel adhesion behavior was also examined. The experimental results showed that van der Waals force was relatively important to the adhesion behavior compared with two other effects. The adhesion ratios of SiO_2 powders to polished stainless steel plates were measured. The adhesion ratios depend on the surface roughness and the particle diameters. The adhered particles on the steel plate were observed by SEM in order to examine the adhesion mechanism of SiO_2 particle on the polished stainless plate substrate. As the result, 0.4-1.0μm particles were easy to adhere independent of surface roughness and nominal powder diameter. The result indicates that adhesion behavior of powder depends on the adhesion force of 0.4-1.0μm particles that are changed by the surface roughness of the steel plate.

日本機械学会論文集(C編)


FATIGUE PROPERTIES OF Ti-6Al-4V SUBJECTED TO 0.9% PHYSIOLOGICAL SALINE SOLUTION

International Journal of Modern Physics B


FATIGUE PROPERIES OF ALUMINUM ALLOY(A6061-T6) WITH ULTRASONIC NANO-CRYSTAL SURFACE MODIFICATION


MAGNETIC PROPERTIES OF FENI NANOWIRE ARRAYS ASSEMBLED ON POROUS AAO TEMPLATE BY AC ELECTRODEPOSITION


Effect of an interface charge density wave on surface plasmon resonance in ZnO/Ag/ZnO thin films


Influence of Deposition Conditions on Fatigue Properties of Martensitic Stainless Steel with TiN Film Coated by Arc Ion Plating Method


Evaluation of crack initiation and fatigue behavior of CrN film deposited on Ti-6Al-4V alloy


A New Approach on Engineering Education in Global Graduate School Program

Journal of University Education and Research


The Characteristics of Multilayer Thin Films Deposited with Metal Thin Film(Ag, Al, Cu)


Influence of Heat Treatment Conditions on Photocatalytic Properties of Oxidized TiN Film

In this study, the photocatalytic activity of annealed TiN powders and films were examined to clarify the influence of annealing temperature and pressure on the photocatalytic properties under UV and visible light irradiation. TiN films were deposited on stainless steel and quartz substrates by DC magnetron sputtering, and annealed TiN powders were used as a reference material to confirm the effectiveness of TiN oxidation. TiN powders which were annealed at 873-1173K, showed obvious photocatalytic activity, under both UV and visible light irradiation. However, annealed TiN films on the stainless steel substrate showed low photocatalytic activity except for those annealed at 823K and 1.0kPa. This is because film annealed above 923 K consisted of a dominant rutile phase, and the film annealed at 1023K delaminated from the stainless substrate. For the quartz substrate, the dominant phase of the films annealed at 823 and 923 K was anatase, and all films remained completely on the substrate after annealing. In particular, the film which was annealed at 923K and 1.0kPa showed high photocatalytic activity both under UV and visible light irradiation. Thus, good photocatalytic activity can be obtained by annealing TiN with an appropriate temperature, pressure and substrate material.

Journal of Solid Mechanics and Materials Engineering


Enhancement of light transmission by coupling to surface plasmon polaritons of a layer-plus-islands silver layer


EFFECT OF BIAS VOLTAGE ON THE FATIGUE LIFE OF MARTENSITIC STAINLESS STEEL WITH TiN FILM COATED USING ARC ION PLATING METHOD


A multistep ac electrodeposition method to prepare Co nanowires with high coercivity


Effect of plasma nitrocarburizing on fatigue strength of SCM435 steel

Journal of Pressure Equipment and Systems


Influence of lon Bombardment Process on Adhesion between CrN Coatings and Aluminum Alloy


Study of Boron-doped Diamond Films by Microwave Plasma CVD Method


Influence of Deposition Bias Voltage on Fatigue Cracking Behavior of Chromium Nitride Film Deposited on Steel


Elevation of fatigue behavior of T-type welded joint in the small-sized single pass boiler

journal of Pressure Equipment and Systems


Influence of Plasma Radical Nitriding on Fatigue Properties of SCM435 Steel


Thermal Fatigue Properties of the Fin in the Boilers


Fatigue Properties of a T Type Welded Joint in a Small-sized Single Pass Boiler Header


Electromagnetic Wave Shielding Properties of ITO/PET Thin Film by Film Thickness


Effect of the interface on the electrical properties of an Indium zinc oxide /SiOx multilayer


The effects of SiO, SiON on IZO thin Film Deposited by DCMG Method

Diffusion and Defect Data Pt.B: Solid State Phenomena


Effects of Dynamic lon Mixing Coating Condition for Fatigue Properties of Stainless Steel with TiN Film


Improvment of Oxidation Property of SUS304 by Gas barrier Coating


Influence of Ion Bombardment on Critical Load of CrN Film Deposited onto Aluminum Alloy by Arc Ion Plating Method

International Journal of Modern Physics B


Fatigue Properties of a T Type Welded Joint in a Small Sized Single Pass Boiler Header


Influence of the SiO and SiON Buffer Layer on IZO Thin Films Deposited on PET by Inclination Opposite Target Type DC Magnetron Sputtering Method


Nano-Indenter Mechanical Properties of ITO/Glass Thin Film Deposited By DC Magnetron Sputtering Method at Low Temperature


Evaluation of Adhesive Behaviors of Chromium Nitride Coating Films Produced by Arc Ion Plating Method

Scratch tests and pin-on-disk wear tests were performed to clarify the cracking and delaminating behavior of CrN coatings. The CrN films were coated onto an aluminum alloy substrate, JIS A2024, by an arc ion plating method. Eight types of single-layered coating and multilayered coatings were prepared by changing the bias voltage during the deposition. L_<CI> and L_<CII> values were not improved by increasing the number of layers. The critical loads of the single-layered coatings decreased with increasing the bias voltage. It appears that, for the multilayered coatings, the combination of bias voltages influenced the critical loads. The critical loads strongly depended on dynamic hardness and Young's modulus. In particular, the critical loads of the multilayered coatings were influenced by the properties of the intermediate and bottom layers as well as the surface roughness, hardness and Young's modulus of the top layer. The large film delamination for single-layered coatings deposited using a high bias voltage occurred during pin-on-disk wear tests even though the critical loads of the single-layered coatings were higher than those of the multilayered coatings. If the brittle top layer could be broken and delaminated by the sliding contact, the ductile bottom layer coated under a bias voltage of 0 V could endure the complete delamination of film.

JSME International Journal, Series A: Solid Mechanics and Material Engineering


Tribological Properties of Artificial Hip Joint Material Coated with DLC Thin Film in The Simulated Body Environment


A Study on the Mechanical Properties of The Honeycomb Sandwich Composites made by VARTM


Chemical Modification of Diamond Films on Pure Titanium Deposited By MPCVD Method


Influence of CrN Film Surface Characteristics on Fatigue Behavor of Stainless Steel Coated with CrN Film by AIP Method

AIP法によりCrN薄膜を被覆したステンレス鋼の疲労挙動に及ぼすCrN膜表面性状の影響

In this study, the influence of droplet distribution on fatigue strength of SUS 304 with CrN film was examined. Three point bending fatigue test were carried out for two series of CrN films coated onto austenitic stainless steel SUS 304 by arc ion plating (AIP) method. The CrN films were deposited under two different coating conditions for obtaining the different droplet distribution. The fatigue strength was decreased by coating under both coating conditions. The fatigue cracks of the coating specimens initiated at stress range below the fatigue limit of uncoated specimen. The difference between the two samples appeared in the crack initiation and propagation behavior. In the case of a few droplets sample, the fatigue cracks initiated on the film surface at the very early stage but the crack growth rate was slow. In the case of the film with many droplets, the crack initiation life was long, however, the crack growth rate was higher than that of a few droplets sample. In addition, It was easy for the film with many droplets to coalesce the fatigue cracks. The fatigue behavior was caused by the difference of these crack initiation and propagation between two samples.

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


Cyclooxygenase-2 inhibitor delays fracture healing in rats

Cyclooxigenase-2 (COX-2) inhibitors have been reported to delay fracture healing. To investigate the major inhibitory period of COX-2 inhibitors in fracture healing, we administrated etodolac, a COX-2-specific inhibitor, to a rat fracture model by altering the period of administration from early to late. After closed fractures had been created at the middle of the femoral shafts in 12-week-old Wister rats, a standardized dose of etodolac was administrated in three ways: group I received it for 3 weeks, group II for just the first week after operation, and group III for just the third (final) week. Group IV was the vehicle control group. Bone maturation was estimated by radiographic scoring system, and mechanically by a three-point bending test. In both the radiographic and mechanical studies, groups I and II showed lower scores than group IV, indicating that even a short period of administration of a COX-2-specific inhibitor in the early phase of fracture healing creates a risk of delayed healing. blacksquare, square, filled.


Deposition of Nanocrystalline Diamond Films on Pure Ti by CH4/H2 Microwave Plasma CVD

メタン/水素マイクロ波プラズマCVD法による純チタン基板上のナノダイヤモンド成膜

マイクロ波プラズマCVD法を用いてメタン/水素混合ガスを流すことによって純チタン基板上にナノダイヤモンドを成膜し，そのナノダイヤモンドの形成過程を明らかにするとともにナノダイヤモンドの性質を解明した．

Journal of the Society of Materials Science, Japan


Influence of Total Sputtering Pressure and Work Voltage on the Optical and Electric Properties of ITO Film onto Unheated Polymeric Substrate Produced by the Inclination Opposite Target Type DC Magnetron Sputtering

傾斜対向ターゲット型DCマグネトロンスパッタ法により有機基板に被覆したITO薄膜の光学的および電気的特性に及ぼすスパッタ圧およびワーク電圧の影響

マグネトロンスパッタリング法によってPET上にコーティングしたITO薄膜の電気抵抗率および光学的透明性に及ぼすスパッタガス圧とワーク電圧の影響を検討したものである．検討の結果，抵抗率に対してガス圧，ワーク電圧とも最適値があることを示した．また，ガス圧，ワーク電圧の透明性に及ぼす影響は小さいことも示した．


Effect of Arc Current on Wear Properties of CrN Film Deposited onto Tool Steel by Arc Ion Plating Method

AIP法で工具鋼に成膜したCrN 薄膜の摩耗特性に及ぼすアーク電流の影響

The wear properties of CrN mm has been investigated as a function of arc current which is one of the processing parameter of arc ion plating (AIP) method. CrN films were coated onto high-speed tool steel substrate under four arc currents of 50, 100, 150 and 200 A. CrN films were also examined using X-ray diffraction. The results obtained in the present study were summarized as follows. The dynamic micro hardness was hardly influenced by the arc current. For SEM observation, many droplets existed on the CrN film, which were generated by the dropping out of the macro-particle of non-evaporated Cr. The distribution of droplet depended markedly on the arc current. The wear weight was also dependent on the arc current. CrN film, which was synthesized at low arc current of 50 A markedly improved the wear resistance. For CrN film coated under the high arc current of 200 A, the wear resistance was less than that of film of 50 A. By the successive observation of wear track using optical microscope, the large adhesive matter was observed on the wear track. For opposite ball, the wear weight increased with decreasing the arc current. It was also seen from SEM observation and EDX that for the wear track, the adhesive matter was opposite ball. The area of adhesion of wear track for CrN film was less for 50 A than for 200 A. For 50 A CrN film, the decreases of adhesion contributed to increases in the wear resistance.

アークイオンプレティング法でCrN薄膜をコーティングした工具鋼の摩耗特性に及ぼすアーク放電電流の影響を検討したものである．検討の結果，高アーク電流で成膜すると，CrNの摩耗特性が悪化することを明らかにした．この摩耗挙動の相違は摩耗試験中における膜の破壊挙動の相違に起因していることをSEMによる詳細な観察から明らかにした．

日本機械学会論文集(A編)


Tribological Properties of TiAlSiN Film Coated by AIP Equipment onto SKD61 Substrate

摩擦摩耗特性に優れたTiAlNにSiを微量に入れたTiAlSiN薄膜をアークイオンプレーティング法で工具鋼上にコーティングし，その摩耗特性を調べた．その際，研磨によって表面粗さを変えた試験片を3種類用意し，表面粗さの影響についても検討を加えた．Siを加えることで摩耗特性が向上することを示し，また薄膜の表面粗さは相手材の摩耗量に強い影響を与えることを示した．

Tribological Research and Design for Engineering Systems


A study on the deposition of ITO films at low temperature by inclination opposite target type DC magnetron sputtering method

傾斜対向ターゲット型DCマグネトロンスパッタリング法を用いてPETフィルムにITO薄膜を室温で成膜し，ITO薄膜の電気的特性，可視光透過率および電磁波シールド特性に及ぼす酸素ガス流量およびバイアス電圧の影響を明らかにした．

International Journal of Modern Physics B


Effects of Nitrogen Gas Flow and Film Thickness on Electric Properties of TiN Thin Film Deposited at Room Temperature

傾斜対向型ターゲットDCマグネトロンスパッタリング法を用いて室温においてPETフィルムにTiN膜を被覆し，可視光透過率，抵抗率および電磁波シールド特性を明らかにした上でTiN薄膜の電磁波フィルターへの応用に対する指針を与えた．


Electromagnetic Wave Shieding Effectiveness of Carbon Fiber Sheet Coated Ferrite Film by Microwave-Hydrothermal Process

マイクロ波超臨界水熱法を利用して炭素繊維表面にフェライト膜を被覆することによって電磁波吸収機能を付与し，その電磁波吸収機能をテムセルを使って定量的に評価し，電磁波吸収機能に影響するフェライトの役割を解明した．


A Study for the Characteristic Changes Under the Repeated Thermal Exposure in the Process of Repairing Aircraft Sandwich Structures

航空機構造体へのサンドウイッチ複合構造体の繰り返し熱履歴を与えたときの損傷が機械的特性に与える影響を定量的に明らかにした．


Effect of intrinsic properties of ceramic coatings on fatigue behavior of Cr-Mo-V steels

Effect of intrinsic properties of ceramic coatings on fatigue behavior of Cr-Mo-V鋼にTiN薄膜などのセラミック薄膜をを被覆したとき，疲労挙動，特に疲労き裂発生挙動に及ぼすセラミック薄膜の被覆の影響をき裂の観察を通して明らかにした．


A Study on Fatigue Fracture Mechanism of Cr-Mo steel SCM435 in Super Long Life Range

超高サイクル領域における中強度鋼の疲労特性を調べるため，SCM435焼入焼戻材を用いて回転曲げ疲労試験を行った．また，予ひずみを与えた試験片も同時に用意し，予ひずみの影響についても検討を加えた．その結果，処女材では明確な疲労限度を示すものの高強度鋼で見られるようなFish-eye破壊は生じなかったのに対し，予ひずみ材では疲労限度が認められず，Fish-eye破壊も生じなかった．ただし，予ひずみ材では材料内部の介在物周りに疲労の痕跡が認められたことを示した．


Fatigue Properties of Nitride Cr-Mo Steel with CrN Thin Film Deposited by AIP Method

低硬度の材料を基板材料としてコーティングすると，繰返し負荷過程で容易にき裂が生じることが明らかにされてきた．本研究ではこの問題を解決し，コーティングによる疲労強度の向上を目指し，基板材料としてクロムモリブデン鋼窒化処理材を使用し，CrN薄膜のコーティングを行った．その結果，低硬度材で見られたコーティングによる疲労強度の低下は無かったが，その強度はコーティングを施していないものと変わらないことを示した．


Tribological behavior of CrN coating on aluminum alloys deposited by arc ion plaling

AIP法を用いてアルミニウム合金にCrN薄膜を被覆し，その薄膜のトライボロジー特性を摩耗痕の観察や重量変化をすべり距離ごとに測定することによって定量的に解明した．


Cyclooxygenase-2 Inhibitor Inhibits the Fracture Healing

骨折後の治療期間に及ぼす麻酔薬の影響を調べるため，麻酔を投与したラットと投与しなかったラットの大腿骨を用い，骨折後の時間経過に伴う骨の強度，剛性の測定を行った．その結果，麻酔薬を用いることで骨の強度および剛性の回復が遅れることを示した．

Journal of Physiological Anthropology and Applied Human Science


Deposition of Amorphous ITO Thin Film at Low-Temperature by Inclined Opposite Target Type DC Magnetron Sputtering Method

傾斜対向ターゲット型DCマグネトロンスパッタリング法による低温アモルファスITO薄膜の作製

傾斜対向ターゲット型DCマグネトロンスパッタリング法によって純Inおよび純Snをターゲットとして用いることにより酸素ガス流量を最適化することによって室温においてPETフィルムにアモルファスITO薄膜を成膜する技術を開発し，成膜したITO薄膜の可視光透過率，電気抵抗率を定量化することによって最適な特性を持つITO薄膜の成膜条件を決定した．

Journal of the Society of Materials Science, Japan


Fatigue Fracture Behavior of High-Strength Steel in Super Long Life Range

四連式回転曲げ疲労試験機を用いて高強度鋼を用いて疲労試験を行うことにより，疲労限度以下の応力においても10∨10サイクルのような超長寿命域において疲労破壊が起こる事実を明らかにし，その破壊機構を解明した．

JSME International Journal, Series A: Solid Mechanics and Material Engineering


Characteristics of Fatigue Crack Initiation and Fatigue Strength of Nitrided ICr-IMo-0.25V Turbine Roter Steel

ICr-IMo-0.25Vタービンローター鋼に窒化処理を施すことにより高強度にさせたときの疲労き裂の発生および疲労強度特性について実験を行い，疲労強度と疲労き裂発生挙動との関係を解明した．


Sloppage mechanism of pediatric spondylolysis:biomechanical study using immature calf spined --- Discussion based on a biomechanical study using immature calf spines

脊椎分離症のメカニズムを明らかにするために若年牛の背骨を使ったすべり曲げ試験を行い若年期固有の骨構造が脊椎分離に与える影響を定量的に検討し，骨構造が大きな影響を与えることを解明した．


Synthesis of Co-, Co-Zn and Ni-Zn ferrite powders by the microwave-hydrothermal method

マイクロ波水熱法を用いてCo-, Co-Zn and Ni-Zn フェライト粉末を合成する手法を開発し，これらのフェライト粉末の形態と磁気特性について定量的に解明した．


Microwave-hydrothermal versus conventional hydrothermal preparation of Ni- and Zn-ferrite powders

マイクロ波水熱法を使ってNiおよびZnフェライトナノ粉末を合成する手法を開発し，その有効性を通常の水熱法と比較検討することによって明らかにした．


Fundamental Characteristics of Shielding Effectiveness for Electromagnetic Wave of Plastic Composite Oriented Fine Copper Wire

銅細線を配向したプラスチック系複合材料の基本的電波遮蔽特性

The electromagnetic interference (EMI) may cause disruptions in robots, personal computers, cellular phones, medical appliance and other electronic instruments. It is therefore important to develop the materials where shield the electromagnetic wave in the environment from the EMI generated by electronic devices. This study was performed to obtain an instruction for the development of smart materials having shielding effectiveness for electromagnetic wave. In the plastic composites used, fine copper wires were oriented with various angles and separations. The fundamental characteristics of shielding effectiveness for electromagnetic wave investigated for the basic plastic composite and carbon fiber reinforced composite. The shielding effectiveness was measured using a copper shielding box located in an electromagnetic shielding room. It was found out that the shielding effectiveness for electromagnetic wave depends on the oriented angle of copper wire. The shielding effectiveness decreased with increasing the wire separation. For carbon fiber reinforced composites, the shielding effectiveness was improved by the contact of carbon fiber each other.

電磁波シールド特性を持つ複合材料を開発するために要求される導電性強化繊維の配向条件を明らかにするために，導電性繊維として銅細線を用い，プラスチック基板に配向方向，配向間隔を変えることによってプラスチック系複合材料の基本的電波遮蔽特性と定量的に解明した．

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


高張力鋼の疲労き裂発生と初期き裂成長挙動に及ぼす窒素イオン注入の影響

高張力鋼の疲労き裂発生と初期き裂成長挙動に及ぼす窒素イオン注入の影響

高張力鋼に窒素イオンをダイナミックミキシング装置を使って注入することによって，高張力鋼の表面の極表層に窒化層を形成することによって疲労き裂発生と初期き裂成長挙動に大きな影響を与え，結果として窒素イオン注入が疲労強度を高める作用があることを解明した．

日本機械学会論文集(A編)


Performance Evaluation on the Reinforceing Material of Plastic Composites for the Electromagnetic Shielding

プラスチック複合材料の電磁波シールド特性をTEMセルを使って定量的に評価し，電磁波シールドに必要な強化繊維の配向，種類および積層方法などの諸条件を解明した．

Trans. of The Korea Society of Mechanical Engineering, Ser. A


HIP処理によって作製した銅合金系複合材料の機械的性質と摩耗特性に及ぼすウイスカー，Ni及びCrの影響

HIP処理によって銅粉末とチタン酸バリュウムウイスカーを使って銅合金系複合材料を作製し，その複合材料の機械的性質と摩耗特性に及ぼすウイスカー，Ni及びCrの影響を定量的に解明した．

日本機械学会論文集(A編)


Evaluation of the Characteristics of Electromagnetic Waves of CFRTP for Multimedia Instrument Applications : 2nd Report, Effects of Compressive and Impact Damage on Shielding Effectiveness of Carbon Fiber-Reinforced Thermo Plastics against an Electromagnetic Wave

マルチメデイア機器へのCFRTPの電波特性と強度特性の評価(第2報CFRTPの電波特性に及ぼす圧縮および衝撃損傷の影響)

The need for plastic composites increases with the increasing use of electronic instruments such as robots, personal computers and cellular phones come into wider use. Carbon fiber-reinforced thermoplastic, CFRTP, is one plastic composite used for electronic instruments. It is favored as a casing for multimedia instruments because it has good deformation and recycling capabilities. It is important to study the shielding effectiveness, SE, of CFRTP against electromagnetic radiation. In the present paper, the shielding effectiveness was experimentally investigated in an electronic shielding room for the CFRTP of which the resin materials were varied in PC, PP, PEI, PMMA and PA. The effects of compressive and impact damage on the shielding effectiveness were studied when the carbon fiber orientation and the space between fiber bundles were changed. The shielding effectiveness strongly depended on the orientation of the carbon fiber. It also decreased when the space between the fiber bundles was increased but was scarcely influenced by the resin materials. When the CFRTP formed a compressive trace on the plate surface by compressive load, the shielding effectiveness increased when the compressive load was increased, and thus depended on the shape of compressive trace.

炭素繊維複合材料の導電性を利用して不要な電波ノイズをカットし，電磁波障害を防ぎ，かつ電子機器のケーシングに適用するときの最適成形条件および衝撃損傷が電磁波シールド特性に与える影響を解明した．

日本機械学会論文集(A編)


Multimedia機器用CFRTPの電波特性に及ぼす損傷の影響

Multimedia機器用CFRTPの電波特性に及ぼす損傷の影響

本論文は，マルチメディア機器が損傷を受けたときを想定して，機器のハウジングが示す電磁波遮蔽特性を明らかにするために模擬的損傷に対する電磁波遮蔽性を検討した．


The Evaluation of the Characteristics of Electromagnetic Waves on CFRTP for Maltimedia Instrument Applications

本論文は，マルチメディア機器への適用を考えてCFRTPの電磁波遮蔽特性を電波暗室内で調べた．その結果，電磁波遮蔽効果はアンテナ距離に反比例することを明らかにした．

The Journal of Korea Electromagnetic Engineering Society


Evaluation of the Characteristics of Electromagnetic Waves of CFRTP for Multimedia Instrument Applications --- 第1報 CFRTPの基本的電波特性

マルチメディア機器への適用のためのCFRTPの電波特性と強度特性の評価 --- 第1報 CFRTPの基本的電波特性

As their in communication and electronic industry expands, it is important to study the shielding effectiveness (SE) of carbon fiber reinforced thermo plastics (CFRTP) against electro magnetic (EM) radiation. In this work, the SE of CFRTP was investigated experimentally in an electronic shielding room using carbon fiber (CF) and glass fiber (GF) reinforced thermo plastics. The resin materials used were polycarbonate (PC), polypropylene (PP), polyetherimide (PEI), polymethylmethacrylate (PMMA) and polyamide (PA). Experimental results indicated that CF was a good EM shielding material. The shielding effectiveness of the composite was found to increase as the number of laminated layers of CFRTP was increased. Other SE characteristics depended on the material used for the resin matrix, the distance of the antennas and the noise frequency band.

本論文は，熱可塑性CFRPの基本的な電波特性を明らかにするために電波案室内で電波遮蔽特性が測定できる送受信アンテナ系からなる測定システムを製作し，CFRPの電波遮蔽効果に及ぼす炭素繊維間隔，炭素繊維配向角度の影響を系統的に検討した．

日本機械学会論文集(A編)


窒素イオン注入した純チタン材の疲労き裂発生と初期疲労き裂成長挙動に及ぼす切欠深さの影響

本論文は，切り欠き半径を一定にして切り欠き深さを変えた純チタン材に窒素イオンを注入して，切欠き底からのき裂発生および初期き裂成長挙動を連続的に調べ，窒素イオン注入及び切欠き深さがき裂発生および初期き裂成長挙動に与える影響を検討した．

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


ニューロ画像処理によるX線フィルムからの溶接欠陥の識別について

ニューロ画像処理によるX線フィルムからの溶接欠陥の識別について

本論文は，これまでの溶接欠陥のX線フィルムからの検出には目視検査に頼っている現状を考慮してX線透過試験を知能化し，溶接欠陥検出感度および識別精度の向上，作業の効率化のためのニューラルネットワークと画像処理システムを組み合わせてX線透過フィルムから溶接欠陥を識別することを試みた．


Evaluation of Mechanical and Wear Properties of Potassium Acid Titanate Whisker-Reinforced Copper Matrix Composites Formed by Hot Isostatic Pressing

本論文は，チタン酸カリウムウイスカーwp銅粉末に配合したのち，HIP処理によって形成して複合材料を作成した．この複合材料の引張特性と磨耗摩擦特性を調べ，これらに及ぼすウイスカーの役割を系統的に検討した．


On Adhesion and Friction-Wear Behavior of Thin Film TiN Laminated Layers Produced by Dynamic Mixing Method

Hard coatings consisting of TiN films were deposited onto high tensile steel by ion mixing. Three laminated layers were prepared on each specimen, with variations of TiN and Ti_2N phases. The effect of the laminated layers on adhesion, friction and wear behavior was studied. The investigation methods included of scratch testing, pin-on-disc wear testing, and dynamic micro-hardness measurement. The laminated layer does not significantly affect the adhesion for the hardness of the film. The unlaminated films have stronger adhesion, showing that interfacial bonding between the layers weakens the overall adhesion of the coatings. A Ti_2N phase laminated layer improves the adhesion slightly when it is either the top layer or at the substrate-coating interface. The TiN and Ti_2N phases have different deformation mechanisms during the scratch test. The steady-state friction coefficient does not vary significantly with sliding up to a distance of 400 meters. High sliding speeds cause more severe pin-on-disc wear.

本論文はダイナミック幹深部法により創製したTinの積層膜に対して密着強度および摩擦磨耗特性，硬さを測定し，積層膜の組成や積層順序によって固さや密着強度が異なり，しかも磨耗特性はそれらの影響を大きく受けることを明らかにした．

JSME International Journal. Series C, Dynamics, Control, Robotics, Design and Manufacturing


A Study on the Characteristics of Electromagnetic Wave of CFRTP

本論文は，CFRTPの電波遮蔽特性を明らかにするために行ったもので，電波の遮蔽に果たす大意祖先異の役割を解明するとともに炭素繊維の集合束がより大きな遮蔽効果をもたらすことを示した．


Effect of Notch Radius on Fatigue Life and Early Fatigue Crack Behavior of Pure Titanium Implanted with Nitrogen Ions

窒素イオン注入した純チタン材の疲労寿命と初期疲労き裂挙動に及ぼす切欠半径の影響

The aim of this study was to investigate the effects of surface modification by ion implantation and notch radius on the fatigue life, crack initiation and early crack growth behavior for pure titanium. Three-point bending fatigue tests were carried out using an electro hydraulic fatigue testing machine under a frequency of 20 Hz and a stress ratio of R=0 in laboratory air at room temperature. The fatigue specimens used were smooth and notched specimens with the notch radii of 0.1, 0.25, 1 and 2 mm. The fatigue crack initiation and the early crack growth were successively observed using an optical microscope adopting a plastic replica method. The main results obtained are summarized as follows. (1) The fatigue life of pure titanium was decreased by the ion implantation. (2) The fatigue crack initiated from the notch root irrespective of ϱ, Δς and ion implantation. (3) The early crack growth patterns were divided into two types : the first type, in which the main crack grew continuously until the final fracture, and the second type, in which the main crack initiated from the notch root and then the secondary crack appeared in front of the main crack. The second type of crack growth tended to be observed with increasing Δς and decreasing ϱ. (4) The fatigue life of the second type of crack growth was greater than that of the first type of crack growth. (5) The first and the second types of crack growth were actually controlled by the same condition of mechanics which is the ς/Δς value of about 1.5.

本論文は，ダイナミックミキシング装置を用いて一定量の窒素イオンを注入した純チタン材について疲労試験を行い，切り欠き底からの微小き裂発生ならびにき裂成長挙動を詳細に検討し，純チタン材の疲労寿命に及ぼす窒素イオン注入の影響を検討した．

日本機械学会論文集(A編)


Development of Expert System for Estimation of Weld Flaws by Ultrasonic Testing

The development of an expert system for ultrasonic testing (UT) can contribute to the improvement and standardization of inspection levels if the technique and experience of the UT engineer can be incorporated into a knowledge data base. It is considered that such an expert system will be one way to solve the problem of the predicted shortage of UT engineers in the near future. The present system was originally developed as a system having a knowledge-based system and an inference engine which are combined with a blackboard model and frame model. In the developed expert system, which is combined with a man-machine interface, it may be advantageous to use a production rule and forward inference. The inference was performed in two steps. The causes of weld flaws were firstly inferred from the welding condition, and then the final result was determined from the UT data. When the present expert system was applied to diagnosis of the welding flaw of a welded structure, the results obtained by the present system agreed with those obtained by the UT engineer up to about 90% of the time. It was therefore confirmed that the expert system is applicable as a method of inference for weld flaws using ultrasonic testing data.

本論文は溶接条件および超音波探傷試験結果から自動的に溶接欠陥を判定するエキスパートシステムを構築して実際の溶接欠陥に適用しながら，開発したエキスパートシステムの有効性を検証した．

JSME International Journal. Series. 1, Solid Mechanics, Strength of Materials


Hardness Characterisation of Thin Carbon Coating

本論文は，マイクロ派プラズマCVDによって被覆したダイヤモンド状炭素膜の硬度を評価する手法を提案し，その有効性を確認した．また，ダイヤモンド状炭素膜をX線回折，およびラマンスペクトルによって薄膜の中にはグラファイト成分とダイヤモンド成分が共存していることを明らかにした．


ダイナミックミキシング法により積層化したTiNx被覆材の疲労特性と疲労き裂挙動について

本論文は，ダイナミックミキシング法によってTiN膜を積層したときのセラミック膜と母相界面のき裂発生挙動に注目してセラミック薄膜の被覆が疲労特性の改善に果たす役割を検討した．

Journal of the Society of Materials Science, Japan


Development of Expert System for Estimation of Weld Flaw by Ultrasonic Testing

超音波探傷試験による溶接欠陥評価のためのエキスパートシステムの構築の試み

Development of an expert system for ultrasonic testing can contribute to improvement and standardization of inspection level if the technique and experience of the UT engineer can be incorporated as the knowledge database. Then, it is considered that such an expert system will be a way to solve the shortage of UT engineers in the near future. The present system has been originally developed as a system having a knowledge base system and inference engine which are combined with a blackboard model and frame model. In the developed expert system, which is unified with a man-machine interface, it may be advantageous to use a production rule and a forward inference. The inference was performed in two steps. The candidates for weld flaw were firstly inferred from the welding condition, and then the final flaw was determined from the UT data. When the present expert system was applied to diagnosis of the weld flaw of the welding structure, the results obtained by the present system agreed with those obtained by the UT engineer up to about 90%. It can then be confirmed that the expert system is available as a method of inference for weld flaws, using ultrasonic testing data.

本論文は，溶接条件及び超音波探傷試験結果から自動的に溶接欠陥の種類と大きさを推論するエキスパートシステムを開発し，技術者との仲介をするマンマシンインターフェイスと統合して，その有効性を実証した．

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


Effect of Anisotropy on Fatigue Properties of Notched CFRP Laminates

平織布CFRPの疲労特性に及ぼす繊維方位の影響

The effect of anisotropy on fatigue properties of notched carbon fiber reinforced plastic laminates has been studied. The off-axis angle of carbon fiber was varied from 0° to 45°. The ultimate tensile strength and the tensile elastic modulus drastically decreased when increasing the off-axis angle of carbon fiber to 30°. When the off-axis angle of carbon fiber increased over 30°, these values approached approximately constant values. The maximum tensile strain also increased and saturated to a constant value when the off-axis angle of the carbon fiber increased. The fatigue strength of notched CFRP laminates showed a similar dependence of ultimate tensile strength on the off-axis angle. The decrease of fatigue strength results from the fatigue damage in relation to the off-axis angle. The fatigue damage process was analyzed in terms of AE measurement and fractography. These results indicate that the fatigue damage process of CFRP laminates was significantly affected by the off-axis angle of carbon fiber.

本論文は，平織布CFRPについて，疲労試験を行い，疲労強度の及ぼす繊維配向の影響を系統的に調べ，疲労強度に果たす炭素繊維の配向の役割を明らかにした．

日本機械学会論文集(A編)


The Effects of Marine Environment on Corrosion Fatigue Crack Propagation Rate of Pure Titanium and Its Weldments in Natural Seawater

本論文は，窒化チタンとその溶接材について疲労き裂伝播速度を天然海水中で求め，それに及ぼす海水の影響を繰り返し速度や腐食電位を変えて検討した．

Fatigue & Fracture of Engneering Materials and Structure


Structure of Thin Film Produced by Ion Beam Mixing Method

本論文は，ダイナミックミキシング法により創製した窒化チタン膜をXPS装置およびオージェ分光分析器を用いて組織および組成分析を行い，窒化チタン膜を創製する最適な条件を明らかにした．

Procs. of 35th the Japan Congress on Materials


The Effects of Content of Carbon Fiber, Test Temperature and Notch Radius on Fatigue Strength of CFRTP

熱可塑性CFRTPの疲労強度に及ぼす炭素繊維含有率，試験温度及び切欠半径の影響

For CFRTP of short carbon fibers in a resin matrix of polyacetal, the effects of carbon fiber content, temperature and notch radius on fatigue behavior have been investigated. Fatigue strength increases with increasing carbon fiber content and decreases with increasing test temperature. Logarithm of fatigue strength for CFRTP with 30% fiber content is proportional to the reciprocal of temperature, 1/T. However, the fatigue strength of CFRTP depends little on the notch radius.

本論文は，熱可塑性プラスチックをマトリックスにしてガラス繊維の含有率を変えて成形した試験片について，疲労強度に及ぼす含有率，試験温度および切欠き半径の影響を試験温度や切欠き半径を変えながら破面解析，剛性低下をもとに解明した．

日本機械学会論文集(A編)


ダイナミックミキシング法によるTiNx被覆材の疲労特性への皮膜組成の影響

ダイナミックミキシング法によるTiNx被覆材の疲労特性への皮膜組成の影響

本論文は，ダイナミックミキシング法により，TiNとTi2Nの割合を系統的に変化させ，疲労寿命に及ぼす影響を検討した．疲労寿命はTiN組成の割合が多いほど改善されることを明らかにした．


The Effects of Microstructure and Fracture Surface Roughness on Near Threshold Fatigue Crack Propagation Characteristics of 2-Phase Casting Stainless Steel

本論文は，マルテンサイトとオーステナイトの2相の微視組織を持つステンレス鋳鉄の疲労き裂伝播挙動を明らかにするために，下限界値近傍の疲労き裂伝播速度を求め，これらに与える微視組織と破面粗さの影響をき裂開閉口の観点から検討した．


Fatigue Crack Propagation Characteristics of Glass Fibre Reinforced Polycarbonate in Hit Distilled Water

本論文は，ガラス繊維強化ポリカーボネイト材の温水中での疲労き裂伝播速度を応力比を変えて求め，破面様相の変化が疲労き裂伝播速度に果たす効果を検討した．


RELATION BETWEEN TEST TEMPERATURES AND NOTCH TIP RADII IN TENSILE FRACTURE MANNER OF CENTER NOTCHED CFRP


Effects of Test Temperature and Hardener on the Tensile Fracture Behavior of Center-Notched CFRP

硬化剤を変えたCFRP切欠試験片の引張破壊挙動に及ぼす試験温度の影響

The effect of hardener on the tensile fracture behavior of carbon fiber-reinforced plastic, CFRP, in which the pitch-type carbon fiber was combined in an epoxy resin matrix with a fiber content of 50 % by weight, was investigated using smooth and notched tensile specimens in a temperature range from 208 K to 413 K. The hardeners used were an acid anhydride and an amine line. Experimental results were discussed in terms of linear notch mechanics. The tensile strength and the fracture morphology of center-notched CFRP plates strongly depend on the test temperature. The brittleductile transition temperature is slightly affected by the notch tip radius, ϱ, regardless of hardeners. In the case of the brittle fracture mode, the CFRP fails under the constant critical elastic maximum stress, ς_<max c>, which is determined by ϱ alone. In the case of the ductile fracture mode, the fracture occurs under the condition of constant nominal stress in the net section which is independent of ϱ.ς_<max c> was lower by about 15 % for an acid anhydride hardener than for an amine line. Furthermore, the transition temperature was lower by about 37 K for the former than for the latter.

本論文は，2種類の硬化剤を用いたCFRP平板について，試験温度が低温から高温まで広範囲に変化したとき，切欠き半径を変えたときの引っ張り破壊挙動を定量的に検討した．

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


Fracture Criterion in Tension Tests of Center Notched Plates of GFRP

中央切欠をもつGFRPの引張りにおける破壊

The tensile fracture behavior of the center notched plates has been studied for composite materials. Tension tests of the center notched plates for glass fiber reinforced polycarbonate have been carried out for a wide range of notch radii and two kinds of width. The fracture process at the notch tip was carefully observed during the tensile testing. Experimental results were discussed in terms of the linear notch mechanics, which considers the combination of the elastic maximum stress at the notch tip and the notch tip radius. The results obtained can be summarized as follows; (1) In the case of notched GFRP, the failure occurred in a brittle manner which was controlled by the constant elastic maximum stress which was governed by the notch tip radius only. (2) The strength characteristics and the fracture were clearly estimated using the parameter, ς_maxc/E, regardless of the content of glass fiber. (3) For polycarbonate, the failure was in a ductile manner, which was controlled by the nominal stress in the net section of each type of specimen.

本論文は，GFRPの引張破壊クライテリオンを解明するために，引張過程における切り欠き底の変化の様子を微視的に観察し，破壊を支配する力学的因子ならびにガラス繊維含有率の影響を明らかにした．

日本機械学会論文集(A編)


ダイナミックミキシング法による窒化チタン被覆材の疲労特性への皮膜組成の影響

ダイナミックミキシング法による窒化チタン被覆材の疲労特性への皮膜組成の影響

本論文は，ダイナミックミキシング法を用いて「HT60高張力鋼表面に窒化チタン膜を被覆して，この薄膜が疲労強度や疲労寿命に与える影響をき裂発生過程や薄膜組織を詳細に検討加えることによって明らかにした．


The Development of Automatic Measurement System of Corrosion Fatigue Crack Length and Its Application to Corrosion Fatigue Behavior of Weldments High Strength Steel in Synthetic Seawater

人工海水中での腐食疲労き裂成長の自動計測システムの開発と高張力鋼溶接材への適用

本論文は，人工海水中での腐食疲労き裂成功を自動計測するために，直流電位差法を適用しマイクロコンピュータによるデータ処理ができるシステムとマイコンによって電気-油圧式疲労試験機を自動制御できるシステムを開発した．

Bulletin of Faculty of Engineering, The University of Tokushima


On Building Diagnostic Expert System for Ultrosonic Testing

超音波探傷試験方法診断エキスパートシステムの構築の試み

Diagnostic expert system for an ultrasonic testing was built upon based on Method of Ultrasonic Angle Beam Testing and Classification of Test Results for Butt Welds in Steel Plates, WES2021-1987. In the present expert system, it may be advantage to use a production role and a backward inference when knowledge presentation was done. The diagnostic time could be reduced because the inference process become evident. Non-destructive inspection engineers can use this expert system on a general microcomputer. In order to confirm the expert system, the ultrasonic testing, which was diagnosed by the present expert system, and the radiographic testing were performed on butt welded joints in steel plate. Results of ultrasonic testing were almost coincident with those of radiographic testing. Therefore, it has been confirmed that the expert system was available on inferring method of ultrasonic testing.

本論文は，疲労破壊と密接に関係している溶接継手の欠陥を検出するための超音波探傷試験方法を推論するためにWES2021に基づいて，専門技術者が探傷現場で容易に操作でき，迅速に所定の目的が達成できるようにマイコンを利用したエキスパートシステムの構築にういて述べている．

日本機械学会論文集(A編)


人工海水中での60kg/mm2級高張力鋼溶接部材の腐食疲労き裂伝ぱ挙動について

人工海水中での60kg/mm2級高張力鋼溶接部材の腐食疲労き裂伝ぱ挙動について

本論文は，60kg/mm2級高張力鋼溶接継手について，圧縮残留応力場を疲労き裂が伝播する場合と母材における人工海水中での腐食疲労き裂伝播挙動を大気中の結果と比較することにより，海水ならびに圧縮残留応力と腐食挙動の関係を解明した．

Journal of the Society of Materials Science, Japan


ガラス繊維強化複合材の疲労き裂伝播速度に及ぼす生理食塩水の影響

ガラス繊維強化複合材の疲労き裂伝播速度に及ぼす生理食塩水の影響

本論文は，ポリカーボネイトガラス繊維強化複合材料の実用的用途を考慮して温度を309Kの一定に保った生理食塩水中の疲労き裂伝播を応力比を変えて測定し，き裂開閉口現象と破壊様相との関連から検討して水環境の影響を解明した．

日本機械学会論文集(A編)


The effects of strain-induced martensitic transformation and temperature on impact fatigue crack propagation behavior of SUS 304 at low temperature.

SUS304の低温衝撃疲労き裂伝ぱ挙動とひずみ誘起マルテンサイト変態の関係

The fatigue crack propagation behavior in fatigue impact at room temperature and 103K was investigated by means of fracture mechanics, X-ray diffraction analysis and fractography for an austenitic stainless steel, SUS 304. The crack growth rate in fatigue impact decreased with decreasing temperature. The crack growth rate at room temperature was scarcely influenced by the microstructure, while at low temperature it was markedly influenced by the microstructure. The effects of microstructure and temperature on the crack growth rate were closely related to the strain-induced martensitic transformation. The martensitic transformation was influenced by the microstructure, the temperature, the fracture morphology and the stress intensity level and resulted in a decrease in crack growth rate with increasing crack opening level.

本論文は，低温下でのSUS304の衝撃疲労き裂伝播特性と温度とひずみ誘起α`マルテンサイト変態との関連において解明するためにX線回折法を用いてその変態量を定量化した．加えて破面解析による微視的観点からの考察も行った．


Fatigue Crack Propagation and Crack Closure Behavior in Polycarbonate and Fiber Reinforced Polycarbonate

本論文は，ポリカーボネイトにガラス繊維を配向した複合材料の疲労き裂成長速度に及ぼす応力比およびガラス繊維含有率の影響をき裂閉口挙動と破壊様相の変化と関連づけて検討し，新しいき裂成長速度則を提案した．

Fatigue & Fracture of Engneering Materials and Structure


The Estimation of the Strain-Induced Martensitic Transformation by Using X-Ray Diffraction Analysis of Fatigue Impact Fracture Surface and Crack Propagation Behavior in Austenitic Stainless Steel

X線回折法によるSUS316衝撃疲労破面のひずみ誘起相変態量の定量化と衝撃疲労き裂伝ぱ挙動について

The volume fraction of strain-induced α' martensite was measured by X-ray diffraction analysis on the fracture surfaces caused by fatigue impact and standard fatigue. The volume fraction of α' martensite increased with increasing ΔK regardless of fatigue impact and standard fatigue. In standard fatigue, this volume fraction increased with increasing stress of ratio and depended on the effective stress intensity range, ΔK_<eff>, at crack tip. If the relation between the volume fraction of α' martensite and ΔK_<eff> in standard fatigue could be used to estimate the effective stress intensity factor, we can get the ΔK_<eff> in fatigue impact. Thus the ΔK_<eff> in fatigue impact was almost equal to maximum stress intensity, K_<max>. The fatigue crack growth rate related to the volume fraction of α' martensite, in spite of fatigue impact, standard fatigue and stress ratio. Hence, the plastic zone formed under fatigue impact should be smaller than that from standard fatigue.

本論文は，SUS316の疲労破面をX線回折法により調査し，ひずみ誘起相変態によるマルテンサイト相の定量化を行い，繰り返し衝撃荷重下および正弦波荷重に変えることによってき裂伝播特性に及ぼす衝撃荷重の効果を検討した．

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


The Effect of Welded Residual Stress and Corrosion Deposits on Corrosion Fatigue Crack Propagation Rate of Butt Welded Joints in Natural Seawater

天然海水中での溶接部材の腐食疲労き裂伝ぱ速度に及ぼす溶接残留応力及び腐食生成物の影響

The corrosion fatigue crack growth behavior in the butt welded joints of carbon steel has been studied and discused in relation to the welding residual stress and corrosion deposits. In air, the fatigue crack growth rate was scarcely influenced by the tensile residual stress, but the compressive residual stress reduced the fatigue crack growth rate. In seawater, the effect of compressive residual stress on the corrosion fatigue crack growth rate was less than that in air. When the stress ratio was increased, this effect was scarcely observrd. However the occurrence of the wedging effect due to corrosion deposits was confirmed in seawater except the case of compressive residual stress at low stress ratio. When the crack clsure occurred by the compressive residual stress in seawater, the corrosion deposits formed within fatigue cracks were fractured by contact with the closing crack planes, but they were formed again. Such an mechanism seemed to occur particularly in the compressive residual stress field. Thus, the corrosion fatigue crack growth rate in the compressive residual stress field was remarkably accelerated by the aggressive attack of seawater.

本論文は，低酸素鋼突合せ溶接継手を用いて腐食疲労き裂が圧縮残留応力場を伝播する場合のda/dNと引張残留応力場にある溶接金属のda/dNと母材のそれを比較しながら溶接残留応力場でのき裂成長速度に及ぼす海水による腐食作用の影響を明らかにした．


The Effects of Cathodic Potential and Calcareous Deposits on Corrosion Fatigue Crack Growth Rate in Seawater for Two Offshore Structural Steels

本論文は，海洋構造物鋼であるC-Mn鋼の腐食疲労挙動を明らかにするために，天然海水中での疲労き裂成長速度に及ぼす陰極暴食および応力比の影響を破壊力学の基づいて検討した．また，腐食生成物の影響を検討するために3%食塩水中での腐食疲労挙動とも比較した．


The Influence of Vacuum on Near-Threshold Fatigue Crack Growth Behavior in 60-40 Brass

60―40黄銅の下限界値近傍における疲労き裂伝播挙動に及ぼす真空の影響

The influence of vacuum environments on near-threshold crack growth behavior in an annealed 60-40 brass have been studied by means of fracture mechanics and fractography. In vacuum, the crack growth rate was smaller than that in air and decreased with decreasing vacuum pressure. When the R ratio and ΔK level increased, the crack growth rate in vacuum approached that in air. The near-threshold crack growth behavior in vacuum was markedly influenced by a fracture roughness, which resulted from a crystalline fracture mode, in addition to a plastic induced crack closure.

本論文は，大気環境の影響を系統的に明らかにする手始めとして60-40黄銅について真空圧を種類に変え，ΔKthおよびその近傍のき裂進展速度をき裂開閉口現象の観点から議論するとともにそれをフラクトグラフィ的結果に基づいて微視的に検討した．

日本機械学会論文集(A編)


An Explanation for Near-Threshold Fatigue Crack Propagation Behavior in Welded Residual Stress Fields by Crack Closure Phenomenon

溶接残留応力場での下限界近傍の疲労き裂伝ぱとき裂開閉口挙動の関係

Fatigue crack growth rates and threshold for crack propagation were determined for CCT and SEN specimens taken from the butt welded joints in 600 MPa grade steel. The crack opening stress has also been determined by using relation between the elastic compliance and loads. The compressive residual stresses resulted in the decrease of fatigue crack growth rates and the increase or threshold values. These behavior strongly depended on the stress ratio. While, the tensile residual stresses resulted in the increase of fatigue crack growth rates and the decrease of threshold values. These behavior scarcely depended on the stress ratio. The effects of welded residual stresses and stress ratio can be correlated by using the effective stress intensity range concept.

本論文は，HT60の突合せ溶接継手を用いて，疲労き裂が，引張および圧縮残留応力場を伝播する場合の下限値および下限値近傍の疲労き裂伝播挙動に及ぼす溶接残留応力の影響をき裂開閉口の観点から応力比との関連において検討した．

Quarterly Journal of the Japan Welding Society


SUS316の衝撃疲労き裂伝播挙動に及ぼす衝撃速度の影響

SUS316の衝撃疲労き裂伝播挙動に及ぼす衝撃速度の影響

本論文はSUS316の衝撃特性に注目し，da/dNに及ぼす衝撃負荷の効果を明白にするために，2種類tの微視組織を持つSUS316について衝撃速度を変えたときの繰返し衝撃荷重下のき裂成長速度を正弦波荷重下のき裂成長速度と比較し，応力比との関連において破壊力学およびフラクトグラフィ的に検討した．

日本機械学会論文集(A編)


Influence of Residual Stress Relief on Fatigue Crack Growth Rate in Welding Residual Stress Field

溶接残留応力場での疲労き裂成長速度に及ぼす残留応力緩和の影響

It is well known that the welded residual stress has marked influence on fatigue crack growth rate in welding structure. In particular, because the tensile residual stress may accelerate the fatigue crack growth rate, it is important to develope the method of residual stress-relief, We have succeeded in relief of residual stress up to about 80% by using a method of mechanical stress relief which was the slow preloading of welded joint. The effects of residual stress relieved, stress ratio and preloading on fatigue crack growth rate in welded joints were investigated in associated with crack closure phenomenon. The results obtained are summarized as follows. (1) For the tensile residual stress fields after preloading, the fatigue crack growth rate was accelerated by the tensile residual stress relieved even if the stress ratio was low. Then, the fatigue crack growth rate accelerated was not changed regardless of the strength of residual stress fields and stress ratio.(2) For the compressive residual stress fields after preloading, the fatigue crack growth rate was considerably lower than that of base metal. After the crack arrested as the stress intensity range approached the threshold for crack growth, the fatigue crack growth rate increased with increasing stress intensity range and stress ratio. (3) The preloading scarecely resulted in the change of crack growth rate in the tensile residual stress field but markedly accelerated the rate in the compressive residual stress field. (4) It became clear that the effects of welding residual stress, stress ratio and preloading on fatigue crack growth rate in welding residual stress files can be explained by the effective stress intensity range defined from both the welding residual stress- and plastic- induced crack closure.

本論文は，溶接残留応力緩和法を開発する手始めとして従来から知られている機械的残留応力緩和法を採用し，600Mpa級高張力鋼突合せ溶接継手に予荷重を加え，緩和した残留応力がき裂成長速度に及ぼす影響を応力比との関連において検討した．

Journal of the Society of Materials Science, Japan


高張力鋼溶接継手の疲労き裂成長速度に及ぼす引張および圧縮残留応力ならびに応力比の影響

本論文は，600Mpa級高張力鋼突合せ溶接継手を用いて，疲労き裂が引っ張りおよび圧縮残留応力場を進展する場合のき裂成長速度挙動を応力比を変えてきてる開閉口挙動と関連づけて検討した．


On the Fatigue Crack Propagation Behavior under Repeated Impacts Using a New Type of Impact Fatigue Testing Machine

衝撃疲労試験機の製作と衝撃荷重下でのステンレス鋼の疲労き裂成長速度挙動について

Machines and structures often encounter repeated impacts in practice. So, it is very important to study fatigue fracture of steel under repeated impacts. Usually a rotating disk type impact fatigue testing machine is used for such study, but the analysis of the data obtained by using this machine is considerably difficult, because the impact phenomenon is transient and has complex characters. So, a new type of machine was made by modifying a rotating disk type impact fatigue testing machine, and fatigue tests under repeated impacts were carried out. Then, the influences of velocity of repeated impacts and stress ratio on the fatigue crack growth rate of stainless steel were investigated by means of fracture mechanics and fractography. The difference in crack growth rate between repeated impacts and more gradually-applied cyclic load was large. This difference was explained by the effective stress intensity factor based on the equivalent stress ratio which includes the repeated impact loading effect.

本論文は衝撃負荷の効果を解明するために，従来の衝撃疲労試験機の問題点を整理した上で新しく衝撃疲労試験機を製作し，フェライト系ステンレス鋼SUS405について繰返し衝撃荷重下の疲労き裂進展挙動を調べた．


On the Estimation of Fatigue Crack Growth Rate at Welding Residual Stresses Fields

溶接残留応力場での疲労き裂成長速度の評価

The present paper is one of researches which are carrying out to clarify the effect of local constraint in the weld zone on fatigue crack growth rates in welded joints. This local constraint may be produced by welding residual stresses, the microstructure and the mechanical properties. In particular, the effect of welding residual stresses on the behavior of which the fatigue crack propagates perpendicularly through the weld bead has quantitatively been investigated by means of fracture mechanics and fractography in association with the crack length to residual stresses field and the stress ratio. The fatigue crack growth rates in welded joints were markedly influenced by welding residual stresses. Namely, the growth rates of which the crack propagated perpendicularly through the weld bead decreased drastically by the compressive residual stresses at some stress intensity level and increased again with increasing stress intensity beyond the minimum value of crack growth rate. This minimum value depended on the initial welding residual stresses, the crack length to residual stresses field and the stress ratio. Therefore, it became clear that the fatigue crack propagation behavior into welding residual stresses fields is well explained by the effective stress intensity factor to define from both the welding residual stresses- and the plastic-induced crack closure.

本論文は，HT60の突合せ溶接継手について，疲労き裂進展速度に及ぼす残留応力の影響を明らかにするために，溶接残留応力が応力比と密接な関係にあることを考慮して応力比を変えることにより残留応力の影響を手威力的に検討すると同時に微視破壊様相の解析からき裂発展に直接寄与する溶接残留応力の推定方法を示した．


焼入れ·焼もどししたCr―Mo合金鋼の疲労強度とき裂進展抵抗に及ぼす微視組織の影響

本論文は，車軸やボルトなどに広く使われているCr-Mo合金鋼(SCM435)について焼き入れ後，焼きもどし温度を広範囲に変えたときの微視組織が疲労強度に及ぼす影響を疲労き裂の発生抵抗および進展抵抗の両面から検討を行った．


A Study on the Impact Fatigue Crack Propagation into the Welding Residual Stresses Field

本論文は，疲労き裂が溶接残留応力場を伝播する場合，疲労き裂進展速度が受ける溶接残留応力の影響に及ぼす衝撃負荷の効果を解明するために計画され，60kg/mm2級超張力鋼溶接継手について検討した．


黄銅の下限界値および低疲労き裂進展速度に及ぼす結晶粒径の影響

黄銅の下限界値および低疲労き裂進展速度に及ぼす結晶粒径の影響

本論文は，40-60黄銅を用い，微視組織を代表する因子として結晶粒径を取り上げ，結晶粒径の変化がΔKthおよびそれにいたるda/dNに及ぼす影響を応力比との関連において破壊力学及びフラクトグラフィ的手法を用いて検討した．


Comparison in Crack Growth Rate between Impact Fatigue and Non-Impact Fatigue in ahigh Strength Steel : Relation among Impact Loading, Stress Ratio and yield Strength

高強度鋼の衝撃疲労及び衝撃でない疲労のき裂進展速度の比較について-衝撃負荷と応力比及び強度レベルの関係-

The impact fatigue tests were carried out by using a rotating disk type impact fatigue testing machine. The influence of impact loading, stress ratio and yield strength on fatigue crack growth rate was investigated by means of fracture mechanics and fractography in quenched and tempered 0.50% carbon steel. Then, the results of impact fatigue tests were compared with those of non-impact fatigue tests. The results obtained are summarized as follows. (1) For the 423 K tempered material, the dominant fracture appearance at impact fatigue was the dimple mode and the cleavage facet while that at non-impact fatigue was the intergranular facet. Such a fracture appearance was called the monotonic one. It was apparent that the acceleration of crack growth rate resulted from the rapid increase in the area percentage of monotonic fracture appearance regardless of the impact fatigue and the non-impact fatigue. (2) For the other tempered materials except the 423 K tempered one, the striation was the dominant fracture appearance. However, the fracture appearance of the 573 and 873 K tempered ones contained some inclusions and precipitation particles among the striation. (3) The effect of impact loading, E_<ac>, defined by the ratio of impact fatigue striation spacing, S_<imp>, to non-impact fatigue one, S_<non>, approached to about 1 as the yield strength, ς_<ys> increased. The effect of impact loading could also be replaced by the equivalent stress ratio, R_<eq>. Then, the R_<eq> has related to ς_<ys>, as follows, R_<eq>=1-α·E_<ac>^-0.5= 1-1.88×10^<-3>·α·ς_<ys>^<0,84>. The R_<eq> decreased with increasing ς_<ys>. This tendency was similar to the effect of stress ratio in non-impact fatigue. (4) The impact fatigue crack growth rate at a given ΔK Ievel was larger than that in non-impact fatigue. This difference in crack growth rate increased with increasing tempering temperature. This fact could be well explained by the concept of equivalent stress ratio.

本論文は，衝撃負荷が破壊様相と密接な関係にあることから，S50Cを用いて焼きもどし温度を変えることにより微視組織や強度レベルを広範囲に変化させたとき，da/dNに及ぼす衝撃負荷の影響がどのように変わるかを応力比との関連において検討した．


アルミニウム合金の疲労き裂進展速度に及ぼす衝撃及び応力比の影響

アルミニウム合金の疲労き裂進展速度に及ぼす衝撃及び応力比の影響

本論文は，衝撃負荷が破壊様相を変える効果があるので，破壊様相がストライエーションで，衝撃負荷により変化せず，かつ応力比がda/dNに顕著な影響を及ぼすと考えられるアルミニウム合金ZK141Fを用いて衝撃負荷と応力比との関連を破壊力学およびフラクトグラフィ的手法に基づいて検討した．


Influence of Prior Austenite Grain Size and Stress Ratio on Near Threshold Fatigue Crack Growth Behavior of High Strength Steels

高強度鋼の下限界値近傍における疲労き裂進展挙動に及ぼす旧オーステナイト粒径及び応力比の影響

The influence of prior austenite grain size and stress ratio on near threshold fatigue crack growth behavior has been studied by means of fracture mechanics and fractography on quenched and tempered Ni-Cr alloy steel where the prior austenite grain size was varied from 21 to 210μm. The results obtained were as follows. (1) For the mid-range of crack growth rates above 5×10^<-6>mm/cycle, the dominant fracture appearance was striation formation regardless of prior austenite grain size and stress ratio. On the other hand, for the near threshold crack growth rate below 5×10^<-6>mm/cycle, the striation-like appearance was mixed with microstructure sensitive fracture appearance such as intergtanular facet. (2) The crack growth rate associated with striation formation was insensitive to the change in prior austenite grain size for all stress ratio, and increased slightly as the stress ratio increased from 0.05 to 0.3. On the other hand, no marked difference in crack growth rate appeared for stress ratio of 0.3 and 0.6. The effect of stress ratio was explained by the crack closure phenomenon. (3) The near threshold crack growth rate at low stress ratio was sensitive to the change in prior austenite grain size, while that in high stress ratio was little sensitive. The greatest sensitivity to stress ratio appeared at near threshold crack growth rate regardless of prior austenite grain size. (4) The consequence of coarsening of prior austenite grain size was to reduce ΔK_<th> in all stress ratio. The ΔK_<th> of both prior austenite grain size decreased with increasing the stress ratio. Also, the grain size dependence was observed to decrease with increasing stress ratio.

本論文は，旧オーステナイト粒内の静的強度をほぼ同じにしてみゅうオーステナイト粒径を変えるために注意深く熱処理したSNC3鋼について，ΔKthおよびそれにいたるda/dNに及ぼす旧オーステナイト粒径の影響を応力比との関連において調べ，破壊力学およびクラフトグラフィt的に検討した．

Journal of the Society of Materials Science, Japan


低温における衝撃疲労き裂進展挙動 --- 旧オーステナイト粒径を変えたSCM3の焼入れ·焼もどし材の場合


The Influence of Test Temperature on Impact Fatigue Crack Growth Behaivior in Quenched and Tempered Cr-Mo Alloy Steels with Different Prior Austenite Grain Sizes

本論文は，焼き入れ．焼きもどししたCr-Mo合金衝撃疲労き裂進展速度に及ぼす試験温度の影響を破壊力学ならびにフラクトグラフィ的手法を用いて検討し，破壊機構と衝撃付加との関係，疲労き裂進展速度とのかかわりを明らかにした

Fatigue of Engneering Materials and Structure


On the Impact Fatigue Crack Growth Behavior in Butt Welded Joint of Mild Steel (Report 1)

軟鋼の突合せ溶接継手の衝撃疲労き裂進展挙動(第1報)

The impact and non-impact fatigue crack propagation tests were conducted on butt welded mild steel specimens. The impact fatigue tests were carried out using the rotating disk type impact fatigue testing machine. The influence of local constraint in the weld zone which was produced by the residual stress and the difference of microstructure and mechanical properties between heat-affected zone and weld metal on imact fatigue crack growth rate was investigated by means of fracture mechanics and fractography, and the results of impact fatigue tests were compared with the non-impact fatigue test results. The important conclusions were as follows. (1) In non-impact fatigue, it was found that the crack growth rate into the direction perpendicular to the weld bead were almost equal to that in parent metal or weld metal. (2) In impact fatigue, it was found that the crack growth rate in weld metal was almost equal to that in parent metal. But, the crack growth rate into the direction perpendicular to the weld bead showed a drastic decrease in the vicinity of the bond. This drastic decrease of crack growth rate was primarily caused by the residual compressive stresses in heat-affected zone. (3) The dominant fracture appearance in impact fatigue was striation as in non-impact fatigue. It was found that the fatigue crack growth rate for all specimen regions except that which propagated into the direction perpendicular to the weld bead in impact fatigue almost agreed with striation spacing. (4) Comparing impact fatigue test results with non-impact fatigue test results, quite large difference of crack growth rates arises from the difference of striation spacings which should be attributed to the impact load wave and impact loading. Therefore, the impact fatigue crack growth rates, (da/dN)_imp, could be expressed as follows, (da/dN)_<imp>=C'(K'_<max>)^<m'>=αC(βK_<max>)^m=αβ^m(da/dN)_<non>.

本論文は，き裂が軟鋼突き合わせ溶接継ぎ手の溶接部を直角に横断する場合について，溶接部の微視組織や強度レベルの差異があるいは溶接残留応力によってもたらされる溶接部の局所的拘束が衝撃疲労および衝撃でない疲労のき裂進展速度に及ぼす影響を破壊力学的ならびにフラクトグラフィ的に検討した．


The Influence of Microstructure and Microscopic Fracture Mechanisms on Fatigue Crack Growth Rates in Steel Plates : 3rd Report, The Case of Quenched and Tempered 0.84% Carbon Steel with Varying Prior Austenite Grain Size --- 第3報 旧オーステナイト粒径を変えたSK5の焼入れ·焼もどし材の場合

鋼板の疲労き裂進展速度を支配する微視組織学的因子ならびに微視破壊機構の影響 --- 第3報 旧オーステナイト粒径を変えたSK5の焼入れ·焼もどし材の場合

本論文は，焼き入れ．焼きもどし鋼の微視組織を代表する単位として旧オーステナイト粒径を取り上げ，その変化がき裂進展速度に反映されることから微視組織および破壊機構の影響を系統的に調べるために，炭素工具鋼SK5を用いて，旧オーステナイト粒径が疲労き裂進展特性にもたらす効果を応力比との関連において検討した．

Transactions of The Japan Society of Mechanical Engineers

日本機械学会論文集(-1978)


Influence of Grain Size on Impact Fatigue Behaviour in Low Carbon Steel

低炭素鋼の衝撃疲労挙動に及ぼす結晶粒径の影響

本論文は自作した衝撃速度の速い回転円板式衝動疲労試験機を用い，衝動でない疲労との関連や強度設計に利用できる衝動応力をパラメーターとして，衝動疲労限度を得るために結晶粒径を3種類に変えた低酸素鋼について，衝動疲労試験を行い，衝動疲労寿命および衝動疲労限度に及ぼす微視組織の影響を衝動でない疲労挙動との比較から検討した．

Bulletin of Faculty of Engineering, The University of Tokushima


鋼板の疲労き裂進展速度を支配する微視組織学的因子ならびに微視破壊機構の影響 --- 第2報 B合金鋼10B35の焼入れ·焼もどし材の場合

本論文は簿論合金鋼(10B35)の焼入れ焼きもどし材について，焼きもどし温度を変えた板状試験片の引っ張り疲労試験を行い，特に低温焼きもどしの範囲において，従来の高強度鋼とは全く異なるきわめて優秀なき裂進展抵抗が確認されたので，それを微視組織学的因子ならびに微視破壊機構の影響との関連において検討したものである．

Transactions of The Japan Society of Mechanical Engineers, Series A

日本機械学会論文集(A編)


引張予加工を与えた低炭素鋼板の疲労き裂進展挙動

引張予加工を与えた低炭素鋼板の疲労き裂進展挙動

本論文は，低炭素鋼の納入材を用いて，引張予加工が疲労強度および疲労き裂進展速度に及ぼす影響を明らかにし，併せてフラクトグラフィ的手法により破壊機構および破壊様式の挙動，ならびにストライエーションの形成に及ぼす着かけ上の降伏応力の効果を検討したものである．

日本機械学会論文集(A編)


鋼板の疲労き裂進展速度を支配する微視組織学的因子ならびに微視破壊機構の影響 --- 第1報 S45Cの焼入れ·焼もどし材の場合

本論文は，中炭素鋼(S45Cの焼きなまし材および焼入れ·焼きもどし材(250℃，350℃および550℃で焼きもどし)について，板状試験片の繰返し引張り疲労試験を行い，疲労き裂進展速度を支配する微視組織学的因子ならびに微視破壊機構の影響を，破壊力学的およびフラクトグラフィ的手法により調べたものである．

日本機械学会論文集(A編)