本文采用轴对称弹塑性非均质材料的有限元程序,分析了插销缺口局部区域的应力状态和塑性变形行为。计算结果表明,缺口处的直力集中系数在弹性范围保持不变;而在塑性范围,应力集中系数随外加载荷的增加而下降。当焊缝强度较低时,塑性变形区主要在焊缝中扩大;当焊缝强度增加时,焊缝中的应力增加,塑性变形区减小。 In this paper, the finite element program of axisymmetric elasto-plastic heterogeneous materials is used to analyze the stress state and plastic deformation behavior in the partial area of ​​bolt notch. The calculation results show that the concentration coefficient of the straight force at the notch remains unchanged in the elastic range, while in the plastic range, the stress concentration coefficient decreases with the increase of the applied load. When the weld strength is low, the plastic deformation zone mainly expands in the weld. When the weld strength increases, the stress in the weld increases and the plastic deformation zone decreases.