Numerical research on the stress concentration factors (SCFs) in uniplanar tubular joints is abundantly reported in literature. However, it has been shown that SCF equations for uniplanar joints can lead to both under- or overestimation of the SCFs in multi-planar joints. In this paper, a parametric finite element study of 81 different three-planar KT joints subjected to five different in-plane bending loading conditions is performed. The effects of different non-dimensional geometrical parameters on the SCF values at the crown locations of the central and outer braces are studied. Based on nonlinear regression analyses of the finite element results, a new set of SCF equations is developed and presented.

文献中大量报道了单平面管状接头中应力集中因子（SCF）的数值研究。但是，已经表明，单平面接头的SCF方程会导致低估或高估多平面接头中的SCF。在本文中，对81种不同的三平面KT接头在五个不同的面内弯曲载荷条件下进行了参数化有限元研究。研究了不同的无量纲几何参数对中央和外部支撑的冠部位置的SCF值的影响。在对有限元结果进行非线性回归分析的基础上，开发并提出了一套新的SCF方程。