基于ANSYS的车身柔性件点焊装配应力分析

Stress analysis of auto-body assembly based on ANSYS

采用通用有限元分析软件ANSYS对点焊装夹过程中垂直装夹间隙、水平装夹间隙和焊点个数等因素对焊点部位最大应力的影响进行分析.采用ANSYS的参数化设计语言建立有限元分析模型,将上述影响因素通过定义变量的形式进行参数化,使用ANSYS内置的点焊模拟功能创建点焊集,同使用耦合自由度的传统点焊模拟方法相比,该方法考虑点焊半径和焊点强度等因素,而且使用很方便.结果表明,同垂直装夹间隙相比,水平装夹间隙对焊点部位影响较大;随着焊点个数增多,有效连接面积增大,单个焊点部位最大应力降低.

Based on finite element method,the influence of vertical clamping gap,horizontal clamping gap and quantity of welding spots on the maximum stress of welding spot was analyzed. Finite element analysis model was established by adopting parametric design language of software ANSYS. The above-mentioned influencing factors were parameterized by defining variables,and spot welding set was created with the built-in spot welding simulation function of ANSYS. Comparing to traditional method of simulating spot welding with coupled degrees of freedom,the proposed method not only had taken into consideration the factors including spot welding radius and strength of welding spot,but also was more convenient for application. The simulation results showed that horizontal clamping gap had greater influence on welding spot than vertical clamping gap,and the maximum stress at each single welding spot reduced with the increasing of welding spots quantity and effective connection area.