中国机械工程2017，Vol.28Issue(6)：739-743,5.DOI:10.3969/j.issn.1004-132X.2017.06.017
高应变速率下铸态AM80镁合金的变形行为及数值模拟
Deformation Behavior and Numerical Simulation of a Casting AM80 Magnesium Alloy under High Strain Rate Loading
摘要
Abstract
The compression deformation behaviors of a solution treated AM80 magnesium alloy were investigated with strain rates of 0.0001 s-1 ,800 s-1 ,1050 s-1 ,1600 s-1 ,1850 s-1 and 2100 s-1 respectively using a INSTRON universal compression machine and a split Hopkinson pressure bar (SHPB)apparatus.The results show that the flow stress of the studied AM80 magnesium alloy in-crease with increasing strain rate as strain rateε˙≤ 1850 s-1 ,demonstrating a visible positive strain rate sensitivity.However,the flow stress decreases slightly as strain rate reaches to 2100 s-1 ,which is attributed to the effects of local temperature rise promoting the dislocation slip and finally the flow stress decreases slightly.The Johnson-Cook model was employed in characterizing the effects of strain rate on mechanical behaviors of the alloy and the material strain rate hardening parameters were taken as a function of strain rates.The results show that the constitutive equation is in good agreement with the experimental ones.Furthermore,the neglects of local temperature rises under high strain rate loading,lead a good agreement to the experimental results at low and medium strains,and a obvious-ly differences will be appeared at high strains for the numerical simulation flow stresses by using ABAQUS software.关键词
AM80镁合金/动态冲击/应变速率敏感性/Johnson-Cook本构方程Key words
AM80 magnesium/dynamic impact/strain rate sensitivity/Johnson-Cook constitu-tive equation分类
矿业与冶金引用本文复制引用
郭鹏程,叶拓,曹淑芬,徐从昌,李落星..高应变速率下铸态AM80镁合金的变形行为及数值模拟[J].中国机械工程,2017,28(6):739-743,5.基金项目
国家科技重大专项(2014ZX0400207) （2014ZX0400207）
国家自然科学基金资助项目(51475156) （51475156）
