The paper is concerned with the problem of stress concentration in cruciform fillet welded joints subjected to axial and bending load. Extended numerical analyses were carried out with the help of the finite element method. It made it possible to estimate stress concentration factors K_t for a variety of geometrical parameters defining the geometry of cruciform welded joints. It has been found that approximate K_t formulas, available in the literature, have two disadvantages, i.e. an unknown accuracy and small range of application with respect to geometrical parameters defining the weld shape. For these reasons, more general and accurate new formulas for stress concentration factors K_t have been derived. Even though the present approach is applicable to all types of welded joints, the analysis presented below has been conducted for a cruciform joint with the weld flank angle of θ = 45°. Final solutions have been given in the form of polynomial expressions, and they can be easily used in computer-aided design procedures.

本文涉及承受轴向和弯曲载荷的十字形角焊缝应力集中的问题。借助于有限元方法进行了扩展的数值分析。对于定义十字形焊接接头几何形状的各种几何参数，可以估算应力集中系数K _t。已经发现，在文献中可获得的近似K _t公式具有两个缺点，即相对于定义焊接形状的几何参数而言，准确度未知并且适用范围较小。由于这些原因，应力集中系数K _t的更通用和准确的新公式已经得出。即使本方法适用于所有类型的焊接接头，也已针对焊缝侧面角为θ  = 45°的十字形接头进行了以下分析。最终解决方案以多项式表达式的形式给出，它们可以轻松地用于计算机辅助设计程序中。