The significance of plastic zone growth under cyclic loading and crack opening/closing model in fatigue crack propagation

被引：6

作者：

Toyosada, M ^{[1
]}

Gotoh, K ^{[1
]}

机构：

[1] Kyushu Univ, Dept Marine Syst Engn, Higashi Ku, Fukuoka 812, Japan

来源：

MATERIALS STRUCTURE & MICROMECHANICS OF FRACTURE IV | 2005年 / 482卷

关键词：

fatigue; cyclic plasticity; crack closure; RPG(Re-tensile Plastic zone's Generated) load; numerical simulation of fatigue crack growth; threshold of stress intensity factor;

D O I：

10.4028/www.scientific.net/MSF.482.95

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fatigue cracks remain closed at lower loading level during a part of load cycle even though a tension-to-tension loading is applied. The crack closure plays a role to obstruct the generation and growth of compressive plastic zone during unloading. Cyclic plastic work, which corresponds to an irreversible energy consumed in a cracked body is generated ahead of a crack, is required as a fatigue crack driving force. The amount of cyclic plasticity is reduced by a crack closure. The crack opening/closing model based on the Dugdale model under arbitrary stress distributions for a through thickness straight crack is proposed and the fatigue crack growth under various loadings is investigated.

引用

页码：95 / 102

页数：8

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