Abstract
Material constraints are important factor effects on the fracture behavior of welded joints. The effect range of the material constraint is an important and interesting issue which needs to be clarified, including whether the effect range of a material constraint exists or not, who will affect it, and whether the material constraint is affected by the no adjacent area or not. In this study, different basic models which reflect different single metallic welded joints, bimetallic welded joints and dissimilar metal welded joints were designed, and the fracture resistance curves and crack tip strain fields of the different models with various material constraints were calculated. Based on the results, the questions above were answered. This study has significance for developing solid mechanics, optimizing joint design, structure integrity assessment, and so on.
Highlights
Constraint is the resistance of a structure or specimen against plastic deformation [1]
It means that the crack is out of the effect range of the material constraint induced by the A508/52Mb interface
That is, when the crack locates out of the effect range of material constraint, the fracture resistance curve of the weld joint no longer influenced by the material constraint anymore
Summary
Constraint is the resistance of a structure or specimen against plastic deformation [1]. The constraint effect due to structure or specimen geometry have been investigated as an important factor affecting the stress distribution around a crack Analyzed a two-material problem where the crack was located in the interface of two dissimilar materials and established a material constraint parameter M to consider the effect of strength mismatch on crack tip stress fields, as follows: σ (1). Xue et al [24] investigated the stress and strain of a micro region influenced by material yield strength mismatch at the crack tip of a dissimilar metal-welded joint. Most studies focus their attention on the strength mismatch of both sides of the crack, such as over-match, under-match, and so on There is another interesting and important issue, the effect range of the material constraint, which needs to be clarified. The questions above were answered, and the effect range of the material constraint was investigated
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