Inserted: 15 oct 2007
Last Updated: 13 nov 2013
Journal: Math. Models Methods Appl. Sci.
The existence of crack evolutions based on critical points of the energy functional is proved, in the case of a cohesive zone model with prescribed crack path. It turns out that evolutions of this type satisfy a maximum stress criterion for the crack initiation. With an explicit example, it is shown that evolutions based on the absolute minimization of the energy functional do not enjoy this property.