Structural-temporal approach and geometry of the fracture zone in spalling

Spalling is one of the main methods of studying the processes taking place in a solid under dynamic stretching. A little explored area is the study of the geometry of the fracture zone formed as a result of impact loading. It has been experimentally established that the qualitative form of the fracture region depends strongly on the parameters of the applied pulse, such as the rate of growth and fall of the load, amplitude, duration. On the basis of the known experimental results it was shown that the observed unstable behavior of the fracture zone formed in the conditions of spalling can be explained by means of the structural-temporal approach based on the concept of the incubation time of failure.