Abstract
Abstract In this paper, a new empirically based constitutive model, the modified Johnson–Cook (J–C) model, has been proposed to incorporate the strain rate effects on the initial yield stress and the strain hardening behavior, respectively. The new model can describe the stress–strain relation of metals over a wide range of strain rates. Based on the tensile impact recovery experimental technique, the material constants in the model can be experimentally determined using isothermal and adiabatic stress–strain curves at different strain rates. Good agreement is obtained between the experimental stress–strain curves for brass under both quasi-static and dynamic loadings and the modified model correlations.
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