Numerical simulation of fracture of plates by confined explosive charges

A numerical simulation of the interaction between an HE charge confined within a shell and an elastoplastic plate was performed. The cases of a fixed charge and a charge with a convex bottom moving at a given velocity were considered. The main features of plate deformation and fracture and the difference of the obtained results from those for an unconfined charge resting on a plate were revealed. It was shown that for the moving charge an optimum (from the point of view of spallation in the plate) size of the contact spot exists at the moment of detonation-wave arrival at the interface between the plate and the charge.