Al-Zn-Mg-Cu铝合金变温双级蠕变时效模型

Modeling the temperature-related two-stage creep aging of Al-Zn-Mg-Cu aluminum alloy

摘要:

针对Al-Zn-Mg-Cu合金变温双级蠕变时效过程,建立了一种考虑蠕变应变与屈服强度的本构框架,通过实验数据的简单拟合方法获得了模型参数。模型不仅以简单的形式具备了处理蠕变时效过程中的应力松弛、强化响应和温度变化的能力,而且能够应用到有限元软件中模拟构件的蠕变量、屈服强度和回弹。模型结果不仅能够适应不同外加应力下实测的蠕变应变曲线,且有限元模拟结果与实测结果能够很好地吻合。

Abstract:

In order to model the creep aging process of Al-Zn-Mg-Cu aluminum alloy using common temperature-related two-stage aging, a constitutive framework is proposed considering the creep strain and yield strength. The material parameters involved in the model were estimated using a simple fitting method from the experimental data. With a simple expression, this model was capable of handling stress relaxation, hardening response, and variable aging temperature in the creep aging process. It could also be implemented using finite element analysis software to simulate the creep strain, yield strength, and springback of the component. The modeling results were consistent with the creep strain curves measured under different applied stresses. The numerical simulations were compared with the applied experimental data and excellent consistency was observed between them.