A hypothesis is put forth which enables the viscoplastician to formulate a theory of viscoplasticity that reduces, in closed form, to the classical theory of creep. This hypothesis is applied to a variety of drag and yield strength models. Because of two theoretical restrictions that are a consequence of this hypothesis, three different yield strength models and one drag strength model are shown to be theoretically admissible. One of these yield strength models is selected as being the most appropriate representation for isotropic hardening.
Steady-State and Transient Zener Parameters in Viscoplasticity: Drag Strength Versus Yield Strength
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Freed, A. D., and Walker, K. P. (May 1, 1990). "Steady-State and Transient Zener Parameters in Viscoplasticity: Drag Strength Versus Yield Strength." ASME. Appl. Mech. Rev. May 1990; 43(5S): S328–S337. https://doi.org/10.1115/1.3120836
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