AA2050合金蠕变时效本构方程的改进

Improvement on the Constitutive Equations for Creep Age Behaviour of AA2050 Alloy

有限元法预测铝合金蠕变成形工件回弹量的关键是蠕变时效本构方程的构建,为更精确模拟铝合金蠕变时效成形过程,本文改进了文献[18]提出的AA2050合金蠕变时效本构方程,提出本构方程中微观组织相关参数的新算法。基于改进后的本构方程,模拟计算了Al-Cu-Li合金AA2050-T34试样受拉应力作用下的蠕变时效行为,计算结果与实验结果吻合良好。改进后的本构方程可用于模拟预测AA2050合金蠕变时效成形行为。

The constitutive model is one of the key technologies in predicting the spring back during creep age forming of the aluminum alloys.To calculate the creep age forming of alloys precisely,the constitutive equations is presented by Li nwere modified.A new numerical algorithm of microstructure-dependant creep variables are presented.The tension creep behaviour of Al-Cu-Li alloy AA2050-T34 is simulated by using of the modified constitutive equations.A good agreement has been achieved between the experimental results,predicted results of Li and the present numerical calculation.The modified constitutive equationscan can be applied to research on the creep age forming of AA2050 aluminium alloys.