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arXiv · 1002.0914

A plasticity model with yield surface distortion for non proportional loading

Marc Louis Maurice François
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Abstract

In order to enhance the modeling of metallic materials behavior in non proportional loadings, a modification of the classical elastic-plastic models including distortion of the yield surface is proposed. The new yield criterion uses the same norm as in the classical von Mises based criteria, and a "distorted stress" Sd replacing the usual stress deviator S. The obtained yield surface is then "egg-shaped" similar to those experimentally observed and depends on only one new material parameter. The theory is built in such a way as to recover the classical one for proportional loading. An identification procedure is proposed to obtain the material parameters. Simulations and experiments are compared for a 2024 T4 aluminum alloy for both proportional and nonproportional tension-torsion loading paths.

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Marc Louis Maurice François. 2010-02-04. A plasticity model with yield surface distortion for non proportional loading. https://doi.org/10.1016/s0749-6419(00)00025-5

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