7075铝合金数值模拟本构方程准确性评估

打开文本图片集

Study on constitutive equation of 7o75 aluminum alloy numerical simulation based onstrain correction

KONGMin，PANZhihui，HUSha，YI Fenglin，HEQin* （Mechanical and Electrical Engineering Department， Wenhua University， Wuhan ）

Abstract： Based on the high temperature tensile test of 7O75 aluminum alloy， the comprehensive efects of deformation temperature， strain rate， high temperature work hardening and dynamic recovery softening on the flow stress of aluminum alloy at high temperature are characterized，and the Arrhenius constitutive equation and Cowper Symonds constitutive equation based on strain correction are established. Their parameters are solved and calculated，and their ability to predict the flow stress is evaluated， The results show that the Cowper-Symonds constitutive equation not only has higher R value than the modified Arrhenius constitutive equation， but also has lower AARE value. It has better prediction ability，and the solution process is simple，which can be more easily applied to numerical simulation.

Key words： 7O75 aluminum alloy; numerical simulation; constitutive equation; rheological stress

0 引言

随着航空航天、汽车制造等领域对轻量化材料需求的日益增长，7075铝合金因其优异的强度与耐热性成为关键结构材料之一。（剩余5790字）