According to contemporary ideas the damage of metals is not a simply catastrophic phenomenon, but a multi-stage process of appearing and development of microdefects, which is called in mechanics a processes of damage accumulation (plastic loosening, fracture, cracking, etc.) Purely brittle fracture is possible only in non-metallic materials with a great quota of covalent part in inter-nuclear link. Historically, the problem of fracture during plastic deformation was first considered from the position of technological interests based on empirical criteria. This approach allowed to solve some easy applied tasks and held back investigations of general problems of metal fracture during the complex stress strain state. Progress has been made in ideas of mechanics of fracture of metals during plastic deformation connected with appearance of dissipated fracture kinetic theories.
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