爆炸与冲击2011，Vol.31Issue(1)：81-87,7.
7A04铝合金的本构关系和失效模型
Constitutive relation and fracture model of 7A04 aluminum alloy＊
摘要
Abstract
The quasi-static and dynamic constitutive relation as well as the fracture model of 7A04 aluminum alloy, from room temperature to 250 ℃, were investigated by using a universal testing machine, a torsion testing machine and the Taylor impact test. Based on the experimental results, the strain hardening term of the Johnson-Cook strength model and the temperature softening item in the Johnson-Cook fracture model were modified. The material constants were calibrated by a combination of experimental tests and numerical simulations. Experimental results show that both the strain and strain rate hardening effect are not significant and that fracture strain increases with the increase of temperature and the decrease of either stress triaxiality or strain rate.关键词
固体力学/失效模型/Taylor撞击/7A04铝合金/Johnson-Cook模型/本构关系Key words
solid mechanics/ fracture model/ Taylor impact/ 7A04 aluminum alloy/ Johnson-Cook model/ constitutive relation分类
数理科学引用本文复制引用
张伟,肖新科,魏刚..7A04铝合金的本构关系和失效模型[J].爆炸与冲击,2011,31(1):81-87,7.基金项目
国家自然科学基金项目(11072072) （11072072）
