EFFECTS OF HYPOELASTIC MODEL AND PLASTIC HARDENING ON NUMERICAL-SIMULATION (SHEAR DEFORMATION OF 2-DIMENSIONAL PLANE BLOCK)

In the present paper we give a finite-element formulation for large-de formation elastic-plastic structural analysis in order to study the ef fects of the utilized constitutive equation on numerical simulation Th e general framework of the constitutive equation for large strain and rotation problems is based on hypoelasticity, where either Jaumann or Green stress rate is assumed. For the plastic hardening rule, the inte rnal time theory is employed, which can be regarded as a combined nonl inear isotropic/kinematic hardening plasticity model retaining the con cepts of 'yield surface' and 'normality rule'. Numerical examples of p lane blocks subjected to shear deformation show how the fundamental fe atures of mechanical response are affected by the constitutive equatio n employed.