榫连结构接触面几何构形对接触区应力分布的影响

为研究并降低传统榫连结构接触区边缘的高应力梯度,对几种典型接触形式展开了有限元分析,计算结果表明不同接触形式将导致不同的接触应力分布;针对某单齿燕尾形榫连结构,建立了一系列不同网格密度的有限元模型计算分析接触区的应力集中程度,并以此提高接触应力的求解精度;并进一步改进了接触面的几何形式,分析表明二维条件下圆弧/直线的接触形式改善了传统平面/平面接触的应力集中,圆弧/圆弧的接触形式将使接触应力进一步降低. 

Effects of profile of contact surfaces on the stress distribution for tenon jointing in blade disk assemblies

In order to investigate and improve the high stress gradient near the edges of contact zone in conventional Tenon Jointing, several typical profiles of contact surface were analyzed by means of finite element method (FEM), it indicated that different contact profile would lead to different stress distribution. Then a set of FE Models with different grids for dovetail attachment were established to analyze stress concentration effects, and to improve the solving accuracy of contact stress. Different profiles of contact surface were chosen, numerical solutions showed that arc/line contact profile for 2D would remove the high stress concentration, and arc/arc one would make contact stress depress further.