Improvement of fatigue limit by overload for high-tensile strength steel containing a crack in the stress concentration zone
Improvement of fatigue limit by overload for high-tensile strength steel containing a crack in the stress concentration zone
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应力集中区含裂纹高强度钢过载疲劳极限的改善
DOI：
10.1108/ijsi-09-2012-0023
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
K. Ando
中科院分区：
文献类型：
--
作者：
K. Houjou;Koji Takahashi;K. Ando
目的-本研究的目的是研究在应力集中区含有裂纹的高拉伸强度钢的疲劳极限下，过载（塑性变形弯矩：Mp）对三点弯曲试样的影响。设计/方法/途径-引入了一个人工半圆形狭缝，并应用MP后进行了弯曲疲劳试验。结果-之间的关系的水平Mp和疲劳极限（σw）成正比;含有0.2-和0.3-mm深的狭缝的试样的疲劳极限提高了Mp过程多达两倍的原始值;的狭缝尺寸，可以呈现无害的Mp过程是一个=0.05毫米的深度;和所有的非传播裂纹周围出现的人工狭缝。独创性/价值-很少有研究已经进行了对疲劳极限的材料含有裂纹样的表面缺陷超载后，在应力集中区。本研究阐明了Mp对细胞凋亡的影响。
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 (σw) 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=0.05 mm 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 t...