Interaction of Mechanical Heterogeneity and Residual Stress on Mechanical Field at Crack Tips in DMWJs

The interaction between the mechanical heterogeneity and the residual stress in dissimilar metal welded joints (DMWJs) leads to a complex mechanical field of crack tips, which strongly affects stress corrosion cracking (SCC) behaviors. A dual-field coupling model was established by using the user-de...

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Bibliographic Details
Published in:Science and technology of nuclear installations 2022-02, Vol.2022, p.1-11
Main Authors: Zhang, Yubiao, Xue, He, Zhang, Shun, Wang, Shuai, Sun, Yuman, Zhang, Yonggang, Yang, Yongjie
Format: Article
Language:English
Subjects:
Crack propagation
Crack tips
Dissimilar material joining
Dissimilar metals
Elastoplasticity
Experiments
Finite element analysis
Finite element method
Heterogeneity
Mechanical properties
Nuclear power plants
Residual stress
Strain distribution
Strain hardening
Stress corrosion cracking
Stress distribution
Stress propagation
Welded joints
Yield stress
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Summary:The interaction between the mechanical heterogeneity and the residual stress in dissimilar metal welded joints (DMWJs) leads to a complex mechanical field of crack tips, which strongly affects stress corrosion cracking (SCC) behaviors. A dual-field coupling model was established by using the user-defined field (USDFLD) and the predefined stress field method based on the elastoplastic finite element method in this study. Thus, the mechanical heterogeneity and the residual stress of the DMWJ are realized. The influence of the interaction between the mechanical heterogeneity and the residual stress on the mechanical field of crack tips at different locations was investigated. The results show that the mechanical heterogeneity causes the stress and strain distribution on both sides of the crack tip asymmetry. And the residual stress affects the magnitude of the stress and strain around the crack tip. The variation trend of the stress and strain along the crack propagation with crack length is basically the same as that of the residual stress. However, the stress and strain distributions are slightly lagging behind the residual stress distribution due to the redistribution of the residual stress caused by the crack propagation. In addition, the stress and strain range of cracks at different positions with crack length are also different.
ISSN:1687-6075
1687-6083
DOI:10.1155/2022/7462200