An alternative finite strain elastoplastic model applied to soft core sandwich panels simulation

An alternative elastoplastic model based on the Flory’s right Cauchy-Green stretch tensor decomposition is proposed and applied to soft cores of sandwich panels. It does not follow usual methodologies as additive or Kröner-Lee multiplicative strains. an important hyperelastic relation, decomposition, from which total strain separated in two isochoric one volumetric parts. Using this energy continues be elastic during all analysis parts are managed produce plastic evolution. As a consequence flow direction known independent yielding surfaces. Moreover, it provides well deviatoric nature For validation purposes, resulting formulation implemented using special 3D prismatic element geometrical nonlinear positional FEM computational code. The achieved numerical results compared with literature experimental data core laminated structural elements.