Effects of dwell time and stress ratio on stress and strain responses of Ti6242 alloy

被引：0

作者：

Zhang M.-D. ^{[1
]}

Cao J.-X. ^{[1
]}

Zhai Z.-J. ^{[2
]}

Yang Z.-N. ^{[1
]}

Zhang B. ^{[2
]}

Sui N. ^{[1
]}

Huang X. ^{[1
]}

机构：

[1] Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys, AECC Beijing Institute of Aeronautical Materials, Beijing

[2] NCS Testing Technology Co., Ltd., China Iron and Steel Research Institute Group, Beijing

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2022年 / 32卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Dwell fatigue; Dwell time; Strain; Stress; Stress ratio; Titanium alloy;

D O I：

10.11817/j.ysxb.1004.0609.2021-36743

中图分类号：

学科分类号：

摘要：

These near α and α+β titanium alloys, such as Ti6242 alloy, usually exhibit dwell fatigue failure characteristic. The investigation results show that the dwell fatigue failure internal mechanism of these titanium alloy is mainly related to the inhomogeneous plastic deformation and local stress concentration under the dwell fatigue load. In this study, the dwell fatigue tests with different dwell time and stress ratio were designed to verify their influences on dwell fatigue life based on the understanding of the soft-hard orientation models. It is found that the dwell fatigue life of Ti6242 titanium alloy decreases monotonously with the increase of dwell time and tends to stabilize, but increases exponentially with stress ratio. According to the detailed analysis of stress and strain curves of Ti6242 alloy under dwell fatigue load, the dwell time mainly affects the redistribution and accumulative coordination processes of local stress and strain, while the stress ratio can intensify the local strain difference between the soft phase and the hard phase in the material. © 2022, China Science Publishing & Media Ltd. All right reserved.

引用

页码：1685 / 1694

页数：9

共 21 条

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