Influence of residual stress and heterogeneity on mechanical field at crack tips in safety end of nuclear power plant

Guo, Rui; Xue, He; Gong, Xiao-Yan

doi:10.1016/j.prostr.2018.12.140

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…Various efforts have been conducted to understand and mitigate the SCC in stainless steels and their welding joints; however, these studies mostly focus on the welding joints of similar metals while the real challenge in dissimilar metal welds is still overlooked [6][7][8]. Dissimilar welding promotes a strenuous task due to the melting point difference [9]. From the SCC's point of view, the resulted dissimilar metal joint is more susceptible to the SCC.…”

Section: Introductionmentioning

confidence: 99%

Stress Corrosion Cracking Threshold for Dissimilar Capacitive Discharge Welding Joint with Varied Surface Geometry

Darmadi

Gapsari

Lobo³

et al. 2020

Applied Sciences

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Stress corrosion cracking (SCC) is known as a major factor that should be considered in the assessment of welding joint structure integrity. Despite the promising and wide application of dissimilar metal joints, the currently available SCC mitigation technique of dissimilar metal joints is not adequate. The challenge is to obtain a good joint while different melting points exist. This article reports a novel SCC mitigation method on a brass–steel dissimilar metal joint by modifying the geometry of the surface. It is evidenced that the sharpened steel (α1 specimen) significantly improves the SCC resilience of the joint. The evaluation of SEM/EDS photos reveals that the α1 geometry induces a smaller pore area around brass–steel micro-joint interfaces which in turn produces stronger joints.

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Section: Introductionmentioning

confidence: 99%

Stress Corrosion Cracking Threshold for Dissimilar Capacitive Discharge Welding Joint with Varied Surface Geometry

Darmadi

Gapsari

Lobo³

et al. 2020

Applied Sciences

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“…Table 2 lists the room-temperature mechanical properties of various DMWJ materials according to Refs. [ 20 , 27 ].…”

Section: Methodsmentioning

confidence: 99%

“…To address the abrupt changes in the interfacial stresses encountered in simplified sandwich composite structures, a temperature field can be introduced to analyze the mechanical behavior in the locality of the DMWJ. To approximate the mechanical heterogeneity in terms of the temperature field, different temperatures can be defined at different locations [ 20 , 21 ]. By reproducing this method, we found that it yielded an approximation of the mechanical heterogeneity in the local regions of the DMWJ.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Mechanical Heterogeneity in Dissimilar Metal Welded Joints

Xue

Wang

et al. 2021

Materials

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Dissimilar metal welded joints (DMWJs) possess significant localized mechanical heterogeneity. Using finite element software ABAQUS with the User-defined Material (UMAT) subroutine, this study proposed a constitutive equation that may be used to express the heterogeneous mechanical properties of the heat-affected and fusion zones at the interfaces in DMWJs. By eliminating sudden stress changes at the material interfaces, the proposed approach provides a more realistic and accurate characterization of the mechanical heterogeneity in the local regions of DMWJs than existing methods. As such, the proposed approach enables the structural integrity of DMWJs to be analyzed in greater detail.

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“…In addition to the mechanical heterogeneity, the residual stress of the DMWJ also has a significant influence on the mechanical field of the crack tip, and it is the dominant driving force affecting SCC behaviors [18][19][20][21]. Some scholars found that the residual stress will noticeably change the stress and plastic strain of the crack tip, and the residual stress is redistributed on account of the crack propagation, which results in the mechanical field of the crack tip becoming more complex [22][23][24]. Substantial studies have shown that the distribution of the residual stress is nonuniform along the weld seam direction.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Xue

Zhang

et al. 2022

Science and Technology of Nuclear Installations

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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.

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Influence of residual stress and heterogeneity on mechanical field at crack tips in safety end of nuclear power plant

Cited by 7 publications

References 8 publications

Stress Corrosion Cracking Threshold for Dissimilar Capacitive Discharge Welding Joint with Varied Surface Geometry

Stress Corrosion Cracking Threshold for Dissimilar Capacitive Discharge Welding Joint with Varied Surface Geometry

Characterization of Mechanical Heterogeneity in Dissimilar Metal Welded Joints

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

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