A study on the mean stress relaxation behavior of 2124-T851 aluminum alloy during low-cycle fatigue at different strain ratios

被引：43
作者：
Hao, Hong [1 ,2 ]
Ye, Duyi [1 ]
Chen, Yingzhen [1 ]
Mi, Feng [1 ]
Liu, Jianzhong [3 ]
机构：
[1] Zhejiang Univ, Inst Proc Equipments, Hangzhou 310027, Zhejiang, Peoples R China
[2] Taiyuan Univ Sci & Technol, Sch Environm & Safety, Taiyuan 030024, Peoples R China
[3] Beijing Inst Aeronaut Mat, Div Mech Properties, Beijing 100095, Peoples R China
来源：
MATERIALS & DESIGN | 2015年 / 67卷
关键词：
Strain ratio; Mean stress; Mean stress relaxation; Empirical model; Strain-life; DEFORMATION; STRENGTH; MICROSTRUCTURE; STEEL; LIFE;
D O I：
10.1016/j.matdes.2014.11.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Strain-controlled fatigue tests of 2124-T851 aluminum alloy were performed under four strain ratios, R = -1, -0.06, 0.06 and 0.5. The fatigue test results indicated that the mean stress relaxation occurred under R not equal -1. The mean stress relaxation rate was dependent on both the strain amplitude and strain ratio. In addition, fatigue life decreased with increasing strain ratio, especially at smaller strain amplitudes, which was attributed to mean stress and its relaxation during cyclic loading. Finally, based on the quantitative analyses of the mean stress relaxation behavior, a modified empirical model that can predict the mean stress relaxation at different strain ratios during fatigue was developed. The empirical model was then incorporated into the strain-life relationship to reflect the mean stress relaxation effects on fatigue life. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：272 / 279
页数：8
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