结构弹塑性灵敏度分析的影响因素研究

The study of influencing factors on the sensitivity of structural elasto-plastic response

提出了一种关于形状变量灵敏度分析的新方法,且考虑了结构的弹塑性响应,弹塑性应力的调整采用切向预测径向返回机制。应用于一个平面应力问题,算例结果表明,该方法独立于设计变量的摄动参数设置及网格的划分形式。

A new approach for performing FE-shape design sensitivity analyses （DSA） of structural models with both linear elastic and elasto- plastic material behaviour is presented. The adjustment of elasto-plastic stress is implemented by tangent forecasting and radial return method. Examples of a plane stress problem testify that the results of the new method are not dependent either on the size of perturbation of the design variables or on the FE mesh refinement among other factors.