It was shown in this paper that the damage degree is estimated by the scalar value , that is equal to 00before plastically strain and is equal to 11at the macrocracs moment. There are two criteria that describe micro damage. The value corresponds to the generation of micro voids that couldn’t be recovered by recrystallization but do not reduce the metal strength. The value corresponds to the generation of micro voids that reduce the metal strength and material longlife. The models of metal damage accumulation during pure and alternate forming also the model of metal damage recovery under the recrystallization are developed. The speciment testing at high loading parameters gives the basic equations of the ductile damage mechanics. All of that gives the method to study ductile damage during the metal forming
