INTEGRAL ESTIMATES TO THE FAST BRITTLE-FRACTURE MECHANICS

In the terms of a general approach the problem of the fast crack propa gation in elastic bodies is considered. The time dependence of, so cal led domain of possible fractures due to the fast crack propagation, is obtained. The dynamic domain of possible fractures is the upper estim ate of the zone of real fractures and thereby it takes into account su ch important features of the fast brittle fracture as the instability of the fast crack propagation, branching, waving, the influence of bou ndary conditions and so on. The problem of dynamic crack initiation is considered in some details. Within the linear fracture mechanics the dynamic criterion of crack initiation is offered.