Relaxation mechanism of the irreversible deformations accompanying dynamic fracture

Ductile fracture is accompanied by plastic deformation. At high loading rates, the stress-strain constitutive relation of materials is usually investigated by introducing additional and empirical ratedependent components into classical models initially developed for quasi-static cases. The structuraltemporal integral approach (STA) provides a new viewpoint for understanding the dynamic response of materials. In the limit case of low-rate loading, STA transfers into the classical quasi-static approach by neglecting certain insignificant components. This work aims to derive a constitutive model from STA rather than using a direct empirical fitting approach and perform the finite element (FE) analysis of the ductile fracture at various loading rates.