3.2开裂原因分析及优化方案的提出

由应力分布可知，开裂处的应力值较大。分析具体结构的传力路径发现，该处结构薄弱，在关门时受冲击力应力值偏大。为了消除车门内板应力集中的现象，可以延长门锁加强板，具体的优化方法如图7。

3.3优化结构验证

结构优化后进行仿真验证，优化后内板的疲劳寿命分布如图8。图8中可以看出，内板最小寿命为1.634个周期，满足目标值，即1.6个周期。该优化方法解决了锁扣处的疲劳开裂问题。经过试验验证，优化后的侧门结构没有出现疲劳裂纹，与仿真结果一致。

4结论

本文采用惯性释放方法预测了侧门内板关门工况下的动态载荷和疲劳寿命。通过与试验分析结果的对比，证明该试验方法预测结果的准确性，在此基础上，我们提出了优化方案并进行仿真和试验验证。本文采用的疲劳预测方法简单，对建模和计算时间要求比较低，并且RADIOSS软件提供良好的疲劳计算方法，使该方法简捷有效，准确地预测出了疲劳危险区域，有效缩短设计开发时间，降低成本。

5参考文献

[1]S.Baskar, Door structural slam durability inertia relief approach. SAE paper No.982309，
   1998.
[2]叶青，洪光辉，王得天，汪霞. 惯性释放在汽车飞翼门slam分析中的应用. 计算机辅助工程，
       Vol.20, No.2, 2011.6.
[3]HyperWorks 11.0 Help

The slam durability analysis of side door based on RADIOSS
Zhao Tingting        Wang Detian

Abstract: The slam durability is one of the most important performances for side door. Now, autos adopt simulation method combined with physical tests to ensure the performance. To reduce the test cost and shorten the research and development loop, we need to establish a simple, fast and accurate CAE method. In this paper, a simulation method of inertia relief and fatigue life based on RADIOSS has been applied to predict the potential durability problem in the door, and relative physical tests are performed to validate the analysis results. The benchmark results show that this method can predict door slam durability accurately and optimize the product structural performance in the early stage of development process, and increase design efficiency.

Key Words: slam durability, inertia relief, RADIOSS, side door