榫接结构接触面几何形式对接触应力的影响

针对接触边界计算精度问题，结合光弹试验，提出了适用于榫接结构接触区的网格划分策略.在此基础上，进一步分析齿形结构和齿形角度对榫接结构接触面接触应力的影响，并应用于梯形齿结构进行验证，认为合理的梯形齿几何结构能够有效地降低接触应力，并且不对其他危险部位造成影响，设计合理的梯形齿相比于圆弧齿具有一定的优势.以梯形齿接触角度为设计变量进行的优化结果表明：接触边界最大等效应力下降25.54%.

Influence of tenon structure contact surface geometry on contact stress

Targeting the contact boundary calculation accuracy problems, grid partition strategy suitable for the tenon structure contact area was proposed in combination with the photo-elastic experiment. On this basis, further analysis of the influence of tooth structure and tooth profile angle on the contact stress was taken, and applied to verify the trapezoidal tooth structure. Result shows that, the trapezoidal tooth of reasonable structure can effectively reduce the contact stress, with less influence on other dangerous parts, so the reasonably designed trapezoidal tooth has a certain advantage compared with the circular arc tooth. After the optimization which takes the trapezoidal tooth contact angle as design variable, the maximum equivalent stress of contact boundary drops 25.54%.