Necking Phenomena of a Fiber-Reinforced Bar modeled by Multisurface Plasticity

摘要

A rate-independent elastoplastic constitutive model for fiber-reinforced composites at finite strains is presented. The model is based on multisurface plasticity and its finite element implementation uses the classical elastic predictor/plastic corrector method. We present a technique for computing the incremental slip parameters satisfying the incremental Karush-Kuhn-Tucker loading/unloading conditions a priori. This technique circumvents the need for a search of the active slip system. Particularized constitutive equations are used to illustrate the peculiar anisotropic necking phenomena of a fiber-reinforced bar at finite strains.