Abstract
The fully anisotropic plasticity theory of Stouffer and Bodner with stress history dependent internal state variables is modified to enforce plastic incompressibility which makes that theory consistent with stability and thermodynamic principles. Pressure dependence of plastic flow could be included through its influence on the hardening variables. An intermediate anisotropic plasticity theory is described which is based on anisotropic work hardening and incremental isotropy of the flow law. A method is suggested for obtaining an effective scalar hardening parameter from the anisotropic components. The incremental isotropic formulation is simpler for numerical calculations and may be adequate for initially isotropic materials.
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