The incubation-time criterion was used for determining the parameters of fracture pulses. The approach was based on the concept of the fracture characteristic time, while the time parameter being taken into account in this concept as the strength characteristic of material that solved the problems on the prediction of dynamic strength of continua. The use of the structural time allowed to explain the experimentally observed effect of optimization of the energy spent on the fracture of materials by pulsed dynamic attacks. It was also found that this energy substantially depended on the attack duration and had the characteristic lowest value.