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| Fatigue Damage Evolution of Welded Joints Considering Residual Stress |
| Received:February 06, 2024 Revised:May 05, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.10.017 |
| KeyWord:residual stress welded joints fatigue damage damage evolution constitutive equations UMAT |
| Author | Institution |
| LIU Zhengyang |
Unit 91007, Fujian Ningde , China |
| SONG Shuangyin |
Shanghai Lingyao Marine Engineering Co., Ltd., Shanghai , China |
| XIE Rong |
Shanghai Lingyao Marine Engineering Co., Ltd., Shanghai , China |
| YU Haiyang |
Shanghai Lingyao Marine Engineering Co., Ltd., Shanghai , China |
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| Abstract: |
| Thework aims to acquire a comprehensive understanding of the specific effect of residual stress on the fatigue behavior of welded joints. The advanced continuous damage mechanics method was adopted to study the fatigue damage evolution process in butt-welded joints under cyclic loading conditions. Thermal-mechanical coupling analysis was employed to assess the residual stresses introduced by the welding processes, thus establishing the initial state of the welded joints for fatigue analysis. Furthermore, a coupled damage cyclic plastic constitutive equation was implemented as a user-defined material subroutine (UMAT) in ABAQUS to develop a finite element model for simulating cyclic loading conditions. During the initial 10 loading cycles, the welded joint exhibited significant stress relaxation, and fatigue damage progressed initially at a slow rate, followed by a rapid acceleration.In the initial loading cycles, a linear relationship was observed between the fatigue damage and the number of cycles, indicating a gradual accumulation of fatigue damage with increasing cycle count. However, once the fatigue damage reached approximately 0.25, its growth rate underwent an obvious acceleration, signaling a significant degradation in material performance, ultimately leading to failure. The findings of this research provide an enhanced capability to predict the fatigue life of welded joints under cyclic loading conditions, offering valuable theoretical guidance for engineering applications. |
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