A model for the large-strain deformation of polyethylene

A model for the large strain deformation of polyethylene under uni-axial te nsion is described. Based on observations made by other researchers, the mo del describes hardening at large strains by considering dislocation nucleat ion and reorientation of slip planes within the crystalline phase. The temp erature and strain-rate sensitivity of this behaviour are predicted with re asonable accuracy in a pipe-grade high-density polyethylene. The model has only three adjustable parameters which are the crystal shear modulus, the Y oung's modulus and a critical dislocation length. (C) 2000 Kluwer Academic Publishers.