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Materials Science and Technology
A constitutive model considering the effects of strain hardening, strain rate hardening, thermal softening and material damage softening is suggested. In order to take the effect of material damage into account, a strain softening term is added in Johnson-Cook flow stress law. The model can predict the overall deformation process of metallic materials at high strain rates and a simple way is provided to determine the coefficients of softening term.
关键词: thermo-viscoplastic;constitutive model;high strain rate;adiabatic shear bands;microstructures;composites;steels;impact
