Propagation behavior of a surface crack occurred at the plate under combined stress state of cyclic bending and static torsion

被引：0

作者：

Ono Y. ^{[1
]}

Li C. ^{[1
]}

Bokura M. ^{[1
]}

机构：

[1] Department of Mechanical and Aerospace Engineering, Tottori University, Minami, Tottori-shi, Tottori, 680-8552

来源：

Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A | 2010年 / 76卷 / 768期

关键词：

Combined stress; Crack opening displacement; Crack propagation; Fatigue; Fracture criterion; √Area parameter model;

D O I：

10.1299/kikaia.76.1076

中图分类号：

学科分类号：

摘要：

Crack propagation behavior under combined stress state of cyclic bending and static torsion is investigated for A7075 aluminum alloy. The propagation direction and the propagation rate of a fatigue crack that occurs from a small hole machined at the specimen surface are affected by a static shearing stress. Especially, the crack propagation rate increases by the existence of a static shearing stress. If the maximum stress intensity factor obtained by using equivalent alternating stress Σa and equivalent static stress Σm is used for arranging the crack propagation rate, all data fall on the almost same curve. Crack opening displacement at the crack tip perimeter increases by the existence of a static shearing stress. The opening component of a static shearing stress is considered to be responsible for this result. If the crack opening displacement behind 50 μn from crack tip is used for arranging the crack propagation rate, the unique relation is obtained regardless of the presence of a static shearing stress.

引用

页码：68 / 73

页数：5

共 16 条

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