Plasticity theory for porous metals
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...…assumes that isotropic hardening is described by a scalar variable p which is interpreted as the plastic deformation of the matrix material so that (Shima and Oyane, 1976): _"p : ¼ ð1 fÞ _p ð10Þ which expresses that the macroscopic plastic work (left-hand side) is equal to the microscopic plastic…...
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...One then assumes that isotropic hardening is described by a scalar variable p which is interpreted as the plastic deformation of the matrix material so that (Shima and Oyane, 1976):...
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...The elliptic form for * was originally developed on a purely phenomenological basis (see, e.g., Green, 1972; Shima and Oyane, 1976; Abouaf et al., 1988) in order to introduce a pressure dependence in the expression of the yield surface....
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