An elastic/viscoplastic theory that includes anisotropic strain hardening is presented. The theory is a combination of the elastic/viscoplastic formulation of Perzyna  and the anisotropic hardening model for time-independent plasticity of Mroz . The theory is used in the analysis of pressure-shear plate impact experiments on commercially pure alpha titanium. Good agreement between theory and experiment is observed.
A Viscoplastic Theory With Anisotropic Hardening and Its Application to Pressure-Shear Plate Impact Experiments
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Gilat, A. (September 1, 1985). "A Viscoplastic Theory With Anisotropic Hardening and Its Application to Pressure-Shear Plate Impact Experiments." ASME. J. Appl. Mech. September 1985; 52(3): 629–633. https://doi.org/10.1115/1.3169112
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