Multiaxial low-cycle fatigue life evaluation under different non-proportional loading paths

被引：34

作者：

Qu, W. L. ^{[1
]}

Zhao, E. N. ^{[1
]}

Zhou, Q. ^{[1
]}

Pi, Y. -L. ^{[2
]}

机构：

[1] Wuhan Univ Technol, Hubei Key Lab Roadway Bridge & Struct Engn, Wuhan 430070, Hubei, Peoples R China

[2] Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2018年 / 41卷 / 05期

基金：

中国国家自然科学基金;

关键词：

critical plane parameter; life prediction; loading path; multiaxial fatigue; non-proportional; METALLIC MATERIALS; PREDICTION; PARAMETER; CRITERION; MODEL;

D O I：

10.1111/ffe.12752

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This paper presents analytical and experimental investigations for fatigue lives of structures under uniaxial, torsional, multiaxial proportional, and non-proportional loading conditions. It is known that the rotation of principal stress/strain axes and material additional hardening due to non-proportionality of cycle loading are the 2 main causes resulting in shorter fatigue lives compared with those under proportional loading. This paper treats these 2 causes as independent factors influencing multiaxial fatigue damage and proposes a new non-proportional influencing parameter to consider their combined effects on the fatigue lives of structures. A critical plane model for multiaxial fatigue lives prediction is also proposed by using the proposed non-proportional influencing factor to modify the Fatemi-Socie model. The comparison between experiment results and theoretical evaluation shows that the proposed model can effectively predict the fatigue life due to multiaxial non-proportional loading.

引用

页码：1064 / 1076

页数：13

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