Rate-Dependent Plasticity Representation for Energy-Absorbing Materialsby Q. H. Zuo,
A. K. Maji,
M. K. Neilsen,
H. L. Schreyer,
Abstract: A three dimensional rate-dependent plasticity constitutive model is developed for rigid polyurethane foams. In the model, the material is decomposed into skeleton and solid matrix from which the material is made. Both the skeleton and solid are represented with an elastic-plasticity model. The transverse isotropy of material is included by incorporating a shift in the effective stress calculation. The shift, limit stress for the skeleton and hardening parameter for the solid are functions of volumetric strain rate to count for strain rate effects.
Subject Headings: Strain rates | Three-dimensional models | Plasticity | Synthetic materials | Foaming (material) | Effective stress
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