金属材料在高应变率下的热粘塑性本构模型  

A THERMO-VISCOPLASTIC CONSTITUTIVE MODEL OF METALLIC MATERIALS AT HIGH STRAIN RATES

作　　者：程国强[1] 李守新[1] 

机构地区：[1]中国科学院金属研究所材料科学国家实验室

出　　处：《弹道学报》2004年第4期18-22,共5页Journal of Ballistics

基　　金：国家自然科学基金资助项目 (5 0 2 710 75 );山西省自然科学基金资助项目 (2 0 0 110 0 3)

摘　　要：提出了一种考虑应变强化、应变率强化、热软化效应及材料损伤的本构模型 ,通过在Johnson Cook热粘塑性本构关系中增加一个随应变增大应力减速小的软化项 ,反映材料的损伤 .该模型可以很好地预测材料的整个变形过程 。A constitutive model considering the effects of strain hardening, strain rate hardening, thermal softening, and material damage was suggested. In order to take the effect of material damage into account, a strain softening term was added in Johnson-Cook flow stress law. The model can predict the overall deformation process of metallic materials at high strain rates. A simple way was provided to determine the coefficients of softening term.

关 键 词：热粘塑性 本构模型 高应变率 损伤 

分 类 号：TJ012.4[兵器科学与技术—兵器发射理论与技术]