CREEP FRACTURE OF NONLINEAR VISCOELASTIC MEDIA UNDERGOING UV RADIATION

摘要

Nonlinear viscoelastic relations to describe the mechanical behavior of polymers and polymer based composites are developed. The nominal stress -strain and creep curves for different values of the current coefficient of lateral deformation are constructed. To model some effects associated with lateral deformation, relations for a nonlinear composite formed of elastic and viscous components are formulated. They are applied to creep fracture of polymers subjected to ultraviolet radiation.