A Simplified Orthotopic Viscoplasticity Theory Based on Overstress
A small strain, unified theory is formulated without yield surfaces and loading/unloading conditions. It contains one tensor valued state variable for which an orthotropic growth law is formulated. Rate sensitivity, creep, relaxation as well as tension/compression asymmetry can be reproduced. A special selection of the material constants permits the modeling of elastic behavior in one direction with viscoplastic behavior in directions perpendicular to it.
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