Constitutive Modeling of Inelastic Deformation in Semi-Cystalline Polymers for Structural Analysis

The constitutive model is developed to describe inelastic deformation of a semi-crystalline polymer for multi-axial loading conditions. The model is calibrated against families of stress-strain curves in a wide range of strain rates and temperatures. For the validation, simulations of the material responses for loading/unloading regimes are performed and the results are compared with experimental data. The model is utilized inside a commercial finite element code with a user material subroutine.