Prediction of Crack Propagation Directions in Dissimilar Metal‐Welded Joints Using Phase‐Field Models and Discussion of Its Mechanisms

Stress corrosion cracking (SCC) in dissimilar metal‐welded joints (DMWJs) poses a significant threat to the safe operation of nuclear power plants. This study employs the phase‐field method to analyze crack propagation paths at various positions in DMWJs of nuclear power safety ends. A user‐defined...

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Bibliographic Details
Published in:Science and technology of nuclear installations 2024-10, Vol.2024 (1)
Main Authors: Zhao, Lingyan, Yang, Bin, Wang, Zheng
Format: Article
Language:English
Subjects:
Algorithms
Corrosion
Crack initiation
Crack propagation
Dissimilar material joining
Dissimilar metals
Energy release rate
Failure
Grain boundaries
Heat affected zone
Heterogeneity
Interfacial cracks
Mechanics
Methods
Nuclear energy
Nuclear power plants
Nuclear safety
Steel pipes
Stress concentration
Stress corrosion cracking
Stress propagation
Welded joints
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Summary:Stress corrosion cracking (SCC) in dissimilar metal‐welded joints (DMWJs) poses a significant threat to the safe operation of nuclear power plants. This study employs the phase‐field method to analyze crack propagation paths at various positions in DMWJs of nuclear power safety ends. A user‐defined material (UMAT) subroutine was implemented to characterize the mechanical heterogeneity of the heat‐affected zone (HAZ) and fusion zone (FZ). The effects of Young’s modulus ( E ), critical energy release rate ( G C ), and mechanical heterogeneity on crack propagation paths were investigated. Results indicate that E has minimal impact on crack propagation paths, while G C significantly influences them. Mechanical heterogeneity in local regions, particularly in the HAZ and FZ, substantially affects crack propagation paths, with the HAZ having the most pronounced effect. Interface crack propagation is identified as the most hazardous. Notably, cracks in 316L/52Mw are less affected by mechanical heterogeneity compared to those in SA508/52Mb.
ISSN:1687-6075
1687-6083
DOI:10.1155/2024/5543346