基于有限元的杆端关节轴承结构优化

Structural optimization of rod end spherical bearing based on finite element

针对某型号杆端关节轴承在疲劳试验时发生断裂的问题,对其原结构进行有限元仿真分析,得到的最大应力位置与实际断裂位置吻合,圆柱段仿真结果误差与应力理论计算结果仅为0.5%,验证仿真结果的可靠性。对杆端体各结构参数依次进行单变量有限元仿真分析,获取各参数对杆端体最大应力和质量的影响,据此确定优化顺序并对关节轴承进行优化。优化后的杆端关节轴承质量增加9.8%,最大等效应力降低14.9%,计算疲劳寿命从500万次提高到4600万次,大于目标疲劳寿命值3000万次,优化后的样件均顺利通过疲劳试验。

As to the failure problem of a type of rod end spherical bearing in fatigue test,the finite element simulation analysis on the original structure is carried out.The position of the maximum stress by simulation coincides with the actual fracture position,and the error between the simulation result and the theoretical calculation result is only 0.5%,which can verify the reliability of the simulation results.The finite element simulation analysis on single variable is carried out for each structural parameter of rod end body in turn,and then the influence of parameters on the maximum stress and mass of rod end body is obtained.Based on these,the optimization sequence is determined and the spherical bearing is optimized.The mass of optimized rod end spherical bearing increases by 9.8%,and the maximum equivalent stress reduces by 14.9%,the calculated fatigue life increases from 5 million times to 46 million times,which is greater than the target fatigue life(30 million times).All of the optimized samples pass the fatigue test successfully.