基于动态材料参数的5083铝合金本构模型

Constitutive model of 5083 aluminum alloy based on dynamic material parameters

通过热压缩试验研究5083铝合金在应变速率为0.01~10 s^(-1)、变形温度为300~500℃、变形程度为50%条件下的流变行为,根据热模拟数据建立基于动态材料参数的双曲正弦函数本构模型(ZHCM)及幂函数本构模型(ZBCM),并对这2种本构模型的应力预测精确度进行计算。研究结果表明:ZHCM与ZBCM均有较高的应力预测精度,应力平均相对误差分别为5.26%和3.92%,相比之下,ZHCM在应变速率为10 s^(-1)、变形温度为300℃的条件下应力精度比ZBCM的高,而当应变速率为0.01~1 s^(-1)、变形温度为350~500℃时,ZBCM的应力精度较高。

The flow stress features of 5083 aluminum alloy were investigated by the isothermal compression test at the strain rates of 0.01-10 s^-1, the temperatures of 300-500 ℃ and the deformation degree of 50%. According to the thermal simulation data, the hyperbolic sine constitutive model（ZHCM） and power function constitutive model（ZBCM） were established based on the dynamic material parameters. Furthermore, the stress prediction accuracies of two constitutive models were calculated. The results show that both ZHCM and ZBCM have high stress precision of prediction, and the average relative errors of stress are 5.26% and 3.92%, respectively. By contrast, the ZHCM has higher stress accuracy at the strain rate of 10 s^-1 and the deformation temperature of 300 ℃, while the stress accuracy of ZBCM predicts more accurately at the strain rate of 0.01-1 s^-1 and the deformation temperature of 350-500 ℃.