拼焊板焊缝两侧母材单元应变状态动态变化研究

In this paper, taking the type of cracking in weak-side base metal as research object, a mechanical analytic model for dynamic variation of strain paths in the base metal is built based on the strain relation of two-side base metals, which considers the discrepancy of integrated strength of base materials. Through this model, the dynamic variation of strain path and the limit strains when base metal element is cracking are analyzed base on different base materials combinations. The strain path in the weak-side base metal is shifting from equal biaxial tensile state which is better for forming to plane strain state that is bad for forming during the forming process when the integrated strengths discrepancy of base metals increasing, which leads to decreasing of the limit strain values in weak-side base metal.