基于Chaboche理论的GH901合金本构模型改进

Improvement of Constitutive Model for GH901 Material Based on Chaboche Theory

为某型航空发动机涡轮盘损伤分析的需要,在涡轮盘材料GH901试件高温拉伸试验、低周疲劳试验、蠕变试验以及疲劳/蠕变交互作用试验基础上,分析Chaboche本构模型特点,基于涡轮盘实际使用中的变幅脉冲循环,将应变幅值记忆项引入Chaboche本构方程;通过已有试验结果,应用量子遗传算法优化得到改进的本构方程各参数。将本构方程计算结果与试验结果对比,证明改进的本构方程是合理的。

For the damage analysis of turbine disc of an aeroengine, the characters of Chaboche constitutive model was analyzed on the basis of high temperature monotonic tension test, low cycle fatigue test, creep test and fatigue creep interaction test of GH901 samples. The stain amplitude memory item was introduced into Chaboche constitutive model on the basis of variational pulse cycles of turbine disc in actural use. The Quantum Genetic Algorithm （QGA） was used to get the parameters of improved constitutive model according to the test result. Compared the calculation result with test result after getting the parameters of improved constitutive model, the improved constitutive model is proved to be reasonable.