Improvement of fatigue limit by shot peening for high‐tensile strength steel containing a crack in the stress concentration zone
Improvement of fatigue limit by shot peening for high‐tensile strength steel containing a crack in the stress concentration zone
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通过喷丸强化应力集中区含裂纹高强度钢的疲劳极限
DOI：
10.1108/17579861311321726
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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应力集中区含裂纹的高强度钢疲劳极限三点弯曲试件的过载(塑性变形弯矩：MP)的影响。设计/方法/途径-介绍了一种人造半圆形缝隙，并施加MP，然后进行弯曲疲劳试验。结果表明：MP含量与疲劳极限(σw)成正比；含0.2 mm和0.3 mm深缝隙的试件的疲劳极限经MP工艺改善为原始值的两倍；MP工艺可使之无害的缝隙尺寸为a=0.0 5 mm；所有非扩展裂纹均出现在人工缝隙周围。原创性/价值--在应力集中区超载后，对含有裂纹状表面缺陷的材料的疲劳极限的研究很少。本研究阐明了甲基强的松龙对小鼠心脏功能的影响。
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...