Comparison of constitutive models for FCC metals over wide temperature and strain rate ranges with application to pure copper

Applicabilities of several well-known constitutive models for BCC metals have been reviewed in detail previously (Modelling Simul. Mater. Sci. Eng. 20 (2012) 015005; Acta Mech. Solid. Sin. 2012, 25(6): 598-608; Int. J. Plasticity, 2013, 40: 163-184). In this paper, descriptive and predictive capabilities of the same models for FCC metals are investigated and compared systematically, in characterizing plastic behavior of cold-worked pure copper at temperatures ranging from 93 K to 873 K, and strain rates ranging from 0.001 s^-1 to 8000 s^-1. Validities of the established models are checked by strain rate jump tests that were performed under different loading conditions. Flexibilities of the models in describing the effects of work hardening, temperature, and strain rate are also analyzed separately. The results show that these models have various capabilities in the characterization of different aspects of material behaviors, but the precision of prediction relies largely on that of description. Different models should be selected considering the specific details of material behaviors to obtain better performance in the engineering application.