Re-examination of fatigue crack propagation mechanism under cyclic Mode II loading

Shigeru Hamada, Taro Suemasu, Motomichi Koyama, Masaharu Ueda, Hiroshi Noguchi

研究成果: ジャーナルへの寄稿Conference article

1 引用 (Scopus)

抄録

The essence of rolling contact fatigue is the so-called "Mode II fatigue crack propagation." However, its understanding has not progressed as much as that of Mode I. We think that this cause is the name: "Mode II fatigue crack propagation." Originally, Modes I and II represented the loading modes for still cracks in fracture mechanics, and not the fatigue crack propagation mechanism. There are many cases where the knowledge of fatigue crack propagation under Mode I loading is applied to that under Mode II loading without consideration. Moreover, in the rolling contact fatigue region where the fatigue crack propagates under Mode II loading, a large plastic deformation is caused by the rolling contact load. Therefore, it is necessary for the test method to reproduce the effects of an actual machine to test materials that exhibit large plastic deformation. Therefore, in this study, we aim to classify the fatigue crack propagation phenomena, regardless of Mode I and II loadings, and re-examine the mechanisms. To that end, we developed a novel test method that enables pure Mode II loading. We used a micro-thin film disc as a specimen, making it possible to cut out and test a part subjected to a large plastic deformation from the actual machine. By observations of the crystallographic structure before the fatigue test and the successive observation of fatigue crack propagation behavior, we propose a crack propagation mechanism, namely, damage accumulation type fatigue crack propagation under Mode II loading, which is different from the opening type fatigue crack propagation.

元の言語英語
ページ(範囲)1026-1031
ページ数6
ジャーナルProcedia Structural Integrity
13
DOI
出版物ステータス出版済み - 1 1 2018
イベント22nd European Conference on Fracture, ECF 2018 - Belgrade, セルビア
継続期間: 8 25 20188 26 2018

Fingerprint

Fatigue crack propagation
Plastic deformation
Fatigue of materials
Fracture mechanics
Crack propagation
Cracks
Thin films

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)

これを引用

Re-examination of fatigue crack propagation mechanism under cyclic Mode II loading. / Hamada, Shigeru; Suemasu, Taro; Koyama, Motomichi; Ueda, Masaharu; Noguchi, Hiroshi.

:: Procedia Structural Integrity, 巻 13, 01.01.2018, p. 1026-1031.

研究成果: ジャーナルへの寄稿Conference article

@article{72ebc2fe7f2340d08defa3b4764774bf,
title = "Re-examination of fatigue crack propagation mechanism under cyclic Mode II loading",
abstract = "The essence of rolling contact fatigue is the so-called {"}Mode II fatigue crack propagation.{"} However, its understanding has not progressed as much as that of Mode I. We think that this cause is the name: {"}Mode II fatigue crack propagation.{"} Originally, Modes I and II represented the loading modes for still cracks in fracture mechanics, and not the fatigue crack propagation mechanism. There are many cases where the knowledge of fatigue crack propagation under Mode I loading is applied to that under Mode II loading without consideration. Moreover, in the rolling contact fatigue region where the fatigue crack propagates under Mode II loading, a large plastic deformation is caused by the rolling contact load. Therefore, it is necessary for the test method to reproduce the effects of an actual machine to test materials that exhibit large plastic deformation. Therefore, in this study, we aim to classify the fatigue crack propagation phenomena, regardless of Mode I and II loadings, and re-examine the mechanisms. To that end, we developed a novel test method that enables pure Mode II loading. We used a micro-thin film disc as a specimen, making it possible to cut out and test a part subjected to a large plastic deformation from the actual machine. By observations of the crystallographic structure before the fatigue test and the successive observation of fatigue crack propagation behavior, we propose a crack propagation mechanism, namely, damage accumulation type fatigue crack propagation under Mode II loading, which is different from the opening type fatigue crack propagation.",
author = "Shigeru Hamada and Taro Suemasu and Motomichi Koyama and Masaharu Ueda and Hiroshi Noguchi",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.prostr.2018.12.191",
language = "English",
volume = "13",
pages = "1026--1031",
journal = "Procedia Structural Integrity",
issn = "2452-3216",

}

TY - JOUR

T1 - Re-examination of fatigue crack propagation mechanism under cyclic Mode II loading

AU - Hamada, Shigeru

AU - Suemasu, Taro

AU - Koyama, Motomichi

AU - Ueda, Masaharu

AU - Noguchi, Hiroshi

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The essence of rolling contact fatigue is the so-called "Mode II fatigue crack propagation." However, its understanding has not progressed as much as that of Mode I. We think that this cause is the name: "Mode II fatigue crack propagation." Originally, Modes I and II represented the loading modes for still cracks in fracture mechanics, and not the fatigue crack propagation mechanism. There are many cases where the knowledge of fatigue crack propagation under Mode I loading is applied to that under Mode II loading without consideration. Moreover, in the rolling contact fatigue region where the fatigue crack propagates under Mode II loading, a large plastic deformation is caused by the rolling contact load. Therefore, it is necessary for the test method to reproduce the effects of an actual machine to test materials that exhibit large plastic deformation. Therefore, in this study, we aim to classify the fatigue crack propagation phenomena, regardless of Mode I and II loadings, and re-examine the mechanisms. To that end, we developed a novel test method that enables pure Mode II loading. We used a micro-thin film disc as a specimen, making it possible to cut out and test a part subjected to a large plastic deformation from the actual machine. By observations of the crystallographic structure before the fatigue test and the successive observation of fatigue crack propagation behavior, we propose a crack propagation mechanism, namely, damage accumulation type fatigue crack propagation under Mode II loading, which is different from the opening type fatigue crack propagation.

AB - The essence of rolling contact fatigue is the so-called "Mode II fatigue crack propagation." However, its understanding has not progressed as much as that of Mode I. We think that this cause is the name: "Mode II fatigue crack propagation." Originally, Modes I and II represented the loading modes for still cracks in fracture mechanics, and not the fatigue crack propagation mechanism. There are many cases where the knowledge of fatigue crack propagation under Mode I loading is applied to that under Mode II loading without consideration. Moreover, in the rolling contact fatigue region where the fatigue crack propagates under Mode II loading, a large plastic deformation is caused by the rolling contact load. Therefore, it is necessary for the test method to reproduce the effects of an actual machine to test materials that exhibit large plastic deformation. Therefore, in this study, we aim to classify the fatigue crack propagation phenomena, regardless of Mode I and II loadings, and re-examine the mechanisms. To that end, we developed a novel test method that enables pure Mode II loading. We used a micro-thin film disc as a specimen, making it possible to cut out and test a part subjected to a large plastic deformation from the actual machine. By observations of the crystallographic structure before the fatigue test and the successive observation of fatigue crack propagation behavior, we propose a crack propagation mechanism, namely, damage accumulation type fatigue crack propagation under Mode II loading, which is different from the opening type fatigue crack propagation.

UR - http://www.scopus.com/inward/record.url?scp=85064675328&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85064675328&partnerID=8YFLogxK

U2 - 10.1016/j.prostr.2018.12.191

DO - 10.1016/j.prostr.2018.12.191

M3 - Conference article

VL - 13

SP - 1026

EP - 1031

JO - Procedia Structural Integrity

JF - Procedia Structural Integrity

SN - 2452-3216

ER -