An Eulerian constitutive model for the inelastic finite strain behaviour of isotropic semi-crystalline polymers

A constitutive model for isotropic, semi-crystalline polymers is proposed. The Eulerian in the sense that it independent of measures total deformation and plastic/inelastic deformations. It able to account such essential phenomena as strain-rate dependence, work hardening, stress relaxation, volumetric inelastic deformations, damage. was applied uniaxial tension tests performed on polyoxymethylene (POM), which a polymer widely used industry. Three types were conducted: monotonic at different strain rates, relaxation tests, loading-unloading tests. reproduce experimental results well. proposed also implemented VUMAT Abaqus, 3D geometry simulated.