A plasticity model with yield surface distortion for non proportional loading
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.
Cite
@article{arxiv.1002.0914,
title = {A plasticity model with yield surface distortion for non proportional loading},
author = {Marc Louis Maurice François},
journal= {arXiv preprint arXiv:1002.0914},
year = {2016}
}