A Model for Dynamic Fracture

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Abstract
It is shown that the dynamic fracture criterion for metals is equivalent to the failure criterion of a Voigt body containing a non-Newtonian dashpot. Integration of the differential equation leads to the concept of a critical incubation time for fracture. Contrary to static fracture criteria, not only is a sufficiently high stress necessary but this stress has also to be present for a sufficiently long time, so that large stresses afford small duration and vice versa. Some consequences of the dynamic fracture law are applied to dynamic metal behaviour at elevated temperatures, as well as to the size of the shock loaded material.

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