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We present a mathematical model for the description of the behavior of viscoplastic materials. The model is based on a nonlinear diierential equation of order , where is a material constant typically in the range 0 < < 1. This equation is coupled with a rst-order diierential equation. For the numerical solution of these equations, we have developed an(More)
A Fungean solid is derived for membranous materials as a body defined by isotropic response functions whose mathematical structure is that of a Hookean solid where the elastic constants are replaced by functions of state derived from an implicit, thermodynamic, internal energy function. The theory utilizes Biot's (Lond Edinb Dublin Philos Mag J Sci(More)
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