研究者詳細 - 黒島　義人

口頭発表・ポスター発表等 - 黒島　義人

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面内純せん断負荷下での炭素鋼薄膜のき裂発生におよぼす微視組織の影響

利光秀康, 黒島義人

M&M材料力学カンファレンス

開催期間： 2017年01月記述言語：日本語

At the same materials, mechanical properties of a film different from those of a bulk and we consider that fatigue property of a film is different from that of a bulk. In this study, we think that formation of fatigue slip band of thin film materials of pure iron , S10C, and S45C, are different from each other and conducted a microscopic observation of the slip band of each thin films. Also we observed strains of each thin films by using Electron Back Scatter Diffraction Pattern (EBSD). As a result, we confirmed that slip bands occurred at the grain boundaries in pure iron, slip bands occurred in a wide range within the grains in S10C and slip bands occurred in a short range within the grains in S45C. Also we consider that strain occurred at the grain boundaries in pure iron, strains occurred in a wide range within the grains in S10C and strains occurred in a short range within the grains in S45C by EBSD. We indicate that in the case of carbon steel, forms of generation of strain within the ferrite crystal grain differs depending on the different in restraint of perlite.

CiNii Article

低合金鋼SNCM439の極低速き裂進展に及ぼす最大応力の影響

池田崇明, 黒島義人

M&M材料力学カンファレンス

開催期間： 2016年01月記述言語：英語

High strength steel shows the unique fatigue fracture called Fish eye failure, that's internal originated fatigue failure, in very long cycle region with the stress below a fatigue limit. Therefore, in order to build the lifetime method evaluation in a very high cycle region, an elucidation of the mechanism of internal fatigue failure is desired. It's reported internal fatigue crack in high strength steel is propagating extremely slowly. However, it is not clear whether this extremely slow fatigue propagation is a phenomenon peculiar to high strength steel. In this study, the materials which were changed hardness of high strength steel SNCM439 were used, and the crack propagation by ΔK decrease fatigue test in vacuum were observed. And it was inquired whether the extremely slow crack propagation would be very peculiar to high strength steel.

CiNii Article

繰返し面内純せん断負荷下での炭素鋼薄膜のき裂発生におよぼす微視組織の影響

山田純平, 黒島義人

M&M材料力学カンファレンス

開催期間： 2016年01月記述言語：英語

Even if metal thin film is the same material, it does not know that different mechanical characteristics form a bulk material are shown, and general fatigue behavior showing a bulk material does not necessarily appear. The present condition is that research of the fatigue behavior in the repetition shear load of a metal thin film is not made compared with the thing of load direction axis and bending. From studies of thin films in the cyclic shear loading to date, a crack with a locally slip in S10C occurs. The cause such crack occurs, the strain in the ferrite by applying the cyclic shear loading occurs, pearlite is considered to crack been concentrated deformed part that is sandwiched between the perlite harder than ferrite because no deformation occurs. So, in this study we used S45C that is high perlite volume fraction and has many of ferrite sandwiched perlite, observed intergranular crack, transgranular crack, and crack with locally slip. As a result, we confirmed difference of crystal orientation near the crack and the crack initiated along slip plane and not reached back face. And we considered that crack was initiated by local concentration of deformation.

CiNii Article

磁歪効果を利用した微小疲労き裂情報の測定

中野稔志, 黒島義人

M&M材料力学カンファレンス

開催期間： 2016年01月記述言語：英語

Small fatigue crack closure is observed as a thing with a possibility that the influence of change of the stress level and a stress ratio, etc. to the crack growth behavior can be explained, and until now various researches have been done. Although there is a method using the strain gage as the dynamic measurement method required for the elucidation of a minute fatigue crack, in respect of generating of minute fatigue cracks being directly contacted to a measuring object thing, and there is a problem in durability or measurement of the crack growth behavior, it may not necessarily be effective. Then, its attention was paid to the magnetostriction effect which is one of the magnetic actions of a ferromagnetic substance. Measurement of the opening stress of the minute fatigue crack under dynamic load and crack length performed by measuring the magnetic field change by the magnetostriction effect, without needing the contact to an object with simple equipment.

CiNii Article

漏洩磁束探傷法を用いたき裂位置測定について

小林忠宏, 黒島義人

M&M材料力学カンファレンス

開催期間： 2016年01月記述言語：英語

In the soundness and safety assessment based on fracture mechanics of equipment and a structure, the nondestructive evaluation of a crack is indispensable. In recent years, various the evaluation method is also developed and studied with remarkable progress of a sensor. An inspection method magnetic also in nondestructive evaluation is an effective inspection method from being safe and being able to automate. In this research, a possibility that the position of crack can be measured was considered by against a rotating test piece of measuring the magnetic flux leakage using the hole sensor. As a result, it is possible to measure position of crack of 2.6mm or more by two-dimensional distribution of magnetic flux leakage.

CiNii Article

OS1323-309 GFRTPの疲労挙動に及ぼす微小き裂伝ぱ様相の影響

吉富匠, 黒島義人, 安藤誠人

M&M材料力学カンファレンス

開催期間： 2015年11月21日記述言語：日本語

FRP can have various properties by compositing materials that have different mechanical property, but the fracture mechanism is very complicated. So far, it is known that strength property of Glass Fiber Reinforced Plastics (GFRP) is greatly changed by modifying the interface between resin and fiber. Consequently, coupling agents are applied to the interface for improving the interface strength. In our research, to improve the interface strength we used Epoxy resin that has similar structure with Polycarbonate (PC) used for matrix, and resin copolymerizing Polydimethylsiloxane (PDMS) that has siloxane bond (Si-O-Si) that is similar structure with glass. About these GFRTP, We did fatigue test and crack propagation test. After that, we considered influence of appearance of micro crack propagation on fatigue behavior of GFRTP

CiNii Article

OS1335-249 面内純せん断負荷における炭素鋼薄膜の疲労挙動におよぼす金属学的因子の影響

植田大輝, 黒島義人

M&M材料力学カンファレンス

開催期間： 2015年11月21日記述言語：日本語

Metal thin films don't necessarily appear general fatigue behavior like a bulk material. By a balk and film material, there is difference of restricted state because of differing in the number of grains to the direction of film thickness. In previous report the diagram of ratio of slipped grains and number of cycle was sorted by film thickness/grain size ratio in carbon steel thin film. Then slip ratio dramatically changed film thickness/grain size ratio 0.81 to 1.00. The influence of grain's existence frequency to direction of film thickness was considered to slip band formation. In this research cross section of carbon steel thin film was observed. As a result, slip deformation occurred over two grains to film thickness. Slip band were faced out of plane when slip system was specified by EBSD.

CiNii Article

G0300207 磁気的特性を利用した微小疲労き裂情報の測定

中野稔志, 黒島義人

年次大会 : Mechanical Engineering Congress, Japan

開催期間： 2015年09月13日記述言語：日本語

Small fatigue crack closure is observed as a thing with a possibility that the influence of change of the stress level and a stress ratio, etc. to the crack growth behavior can be explained, and until now various researches have been done. Although there is a method using the strain gage as the dynamic measurement method required for the elucidation of a minute fatigue crack, in respect of generating of minute fatigue cracks being directly contacted to a measuring object thing, and there is a problem in durability or measurement of the crack growth behavior, it may not necessarily be effective. Then, its attention was paid to the magnetostriction effect which is one of the magnetic actions of a ferromagnetic substance. Measurement of the opening stress of the minute fatigue crack under dynamic load and crack length performed by measuring the magnetic field change by the magnetostriction effect, without needing the contact to an object with simple equipment. Moreover, it measured by having changed cross-sectional shape of the specimen. Resulting in, opening stress of the minute fatigue crack opening stress was able to measure about specimen regardless of the cross-sectional shape of the specimen. However, at this stage, it is possible to perform a crack length measurement can only specimen having a circular cross-section.

CiNii Article

G0301305 高強度鋼の極低速き裂進展下におけるODA形成に及ぼす応力比の影響

池田崇明, 黒島義人

年次大会 : Mechanical Engineering Congress, Japan

開催期間： 2015年09月13日記述言語：日本語

It's well known High Strength Steel shows internal origin type fatigue failure called Fish eye failure in low stress and high cycle region. In this failure, ODA(Optically Dark Area) is formed and this ODA occupies the great portion of fatigue life of Fish eye failure. Although the explication of the mechanism of ODA formation is needed for the explication of the Fish eye failure mechanism, the explication is not yet accomplished. It's reported that internal fatigue crack in high strength steel is propagating extremely slowly by recent investigations. However, it is not clear the relationship between the extremely slow fatigue crack growth behavior and the mechanism of ODA formation, and whether it is a peculiar phenomenon of high strength steel. In study, fatigue test was done in vacuum environment. As a result, fractography suggest that more obvious ODA is formed by smaller stress ratio when internal crack is extremely slowly propagating.

CiNii Article

繰返しせん断負荷における炭素鋼薄膜の疲労挙動に及ぼす微視組織の影響

本人

日本機械学会M&M2012材料力学カンファレンス

切欠きを有するポリカーボネートの動的応力集中とひずみ速度集中の解析

本人

日本機械学会M&M2012材料力学カンファレンス

真空環境下における低合金鋼の極低速き裂進展挙動

本人

日本機械学会M&M2012材料力学カンファレンス

ポリジメチルシロキサン共重合ポリカーボネートの衝撃強度におよぼす負荷速度の影響

本人

日本機械学会M&M2012材料力学カンファレンス

樹脂を変性させたGFRPにおける疲労強度特性と損傷機構の関係

本人

日本機械学会M&M2012材料力学カンファレンス

切欠きを有するポリカーボネートの動的応力集中解析

本人

日本機械学会九州支部第65期総会・講演会

ポリジメチルシロキサンを共重合したポリカーボネートの衝撃破壊挙動

本人

高温強度・破壊力学合同シンポジウム

磁歪効果を利用した微小疲労き裂のき裂長さの測定

本人

日本機械学会M&M2011材料力学カンファレンス

ポリジメチルシロキサンを共重合したポリカーボネートの衝撃強度に関する検討

本人

日本機械学会M&M2011材料力学カンファレンス

樹脂/繊維界面を改質したＧＦＰＣにおける疲労強度特性と損傷機構の関係

本人

日本機械学会M&M2011材料力学カンファレンス

真空環境下における高強度鋼のき裂進展挙動と開口応力の関係

本人

日本機械学会M&M2011材料力学カンファレンス

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