Coupling analysis of welding residual stress redistribution and crack propagation

被引：0
|
作者：
Gao, Hai-Yang [1 ]
Luo, Guang-En [1 ]
Zheng, Xin-Zhao [1 ]
Chai, Ying [1 ]
机构：
[1] School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang,212100, China
来源：
Chuan Bo Li Xue/Journal of Ship Mechanics | 2024年 / 28卷 / 11期
关键词：
Titanium alloys;
D O I：
10.3969/j.issn.1007-7294.2024.11.012
中图分类号：
学科分类号：
摘要：
Welding residual stress has a significant impact on the fatigue life of a welding structure. Meanwhile, welding residual stress is not invariable, but will be redistributed with crack propagation. Therefore, the coupling study of welding residual stress redistribution and crack propagation is very important to predict the fatigue life of a welded structure accurately. Based on thermal elastic-plastic finite element method and extended finite element method (XFEM), a fatigue life analysis method considering the coupling of residual stress redistribution and crack propagation was proposed in this paper. Taking the tensile fatigue sample of TC4 titanium alloy as an example, the redistribution of the welding residual stress along with crack propagation was studied with the extended finite element method. The welding residual stress distribution in front of the crack tip during crack propagation and the fatigue crack propagation a-N curve under the redistribution of weld residual stress were calculated by cyclic iteration. The calculation results show that the welding residual stress at the crack tip increases firstly and then decreases with the crack propagation. Compared with the results based on constant value of the residual stress, the extended finite element fatigue life analysis method considering the redistribution of the residual stress is more accurate to predict the fatigue lives of welding structures. © 2024 China Ship Scientific Research Center. All rights reserved.
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页码：1756 / 1767
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