Improvement of fatigue limit by overload for high-tensile strength steel containing a crack in the stress concentration zone

被引：4

作者：

Houjou, Keiji ^{[1
]}

Takahashi, Koji ^{[2
]}

Ando, Kotoji ^{[2
]}

机构：

[1] Oyama Natl Coll Technol, Dept Mech Engn, Oyama, Japan

[2] Yokohama Natl Univ, Dept Energy & Safety Engn, Yokohama, Kanagawa, Japan

来源：

INTERNATIONAL JOURNAL OF STRUCTURAL INTEGRITY | 2013年 / 4卷 / 03期

关键词：

Fatigue limit; Overload; Plastic bending; Rendering crack harmless; Stress concentration;

D O I：

10.1108/IJSI-09-2012-0023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Purpose - The purpose of this study was to investigate the effect of overload (bending moment with plastic deformation: Mp) on three point bending specimen at the fatigue limit of high-tensile-strength steel containing a crack in the stress concentration zone. Design/methodology/approach - An artificial semi-circular slit was introduced and Mp was applied after which bending fatigue tests were carried out. Findings - The relationship between the level of Mp and the fatigue limit (sw) was proportional; the fatigue limits of specimens containing 0.2-and 0.3-mm-deep slits are improved by the Mp process as much as twice the original values; the slit size that can be rendered harmless by the Mp process is a = 0.05mm in depth; and all non-propagating cracks appeared around the artificial slit. Originality/value - Very few studies have been conducted on the fatigue limit of materials containing crack-like surface defects after overload in the stress concentration zone. This study elucidated the effect of Mp on the fatigue limit.

引用

页码：368 / 382

页数：15

共 17 条

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