Abstract
Bifurcation phenomena of initially homogeneous elasto-plastic specimen under uniform compression are numerically investigated. The finite strain, associated, strain hardening Drucker-Prager plasticity model is employed as a material model. Deformation of the specimen remains uniform on the primary equilibrium path, whereas non-uniform deformation modes arise due to bifurcation. We carry out several numerical analyses for bifurcation modes and post-bifuraction behavior without imposing initial imperfections, and show that diffuse bifurcation modes are one of the important factors for the occurrence of localized deformations. We also discuss the numerical results of path jumping phenomena.
