“ Finite Element Simulation of Ring Expansion and Fragmentation ”

The expanding ring test of Grady and Benson [20] is taken as a convenient yet challenging validation problem for assessing the delity of cohesive models in situations involving ductile dynamical fracture. Attention has been rescricted to 1100-0 aluminum samples. Fracture has been modelled by recourse to an irreversible cohesive law embedded into cohesive elements. The nite element model is three dimensional and fully lagrangian. In order to limit the extent of deformation-induced distortion, we resort to continuous adaptive remeshing. The cohesive behavior of the material is assumed to be rate independent and, consequently, all rate e ects predicted by the calculations are due to inertia and the rate dependency in plastic deformation. The numerical simulations are revealed to be highly predictive of a number of observed features, including: the number of dominant and arrested necks; the fragmentation patterns; the dependence of the number of fragments and the fracture strain on the expansion speed; and the distribution of fragment sizes at xed expansion speed.