The nature of fracture in solids

Various types of deformation of ionic single and polycrystalline samples revealed that the variation of fracture stress with stress rate temperature, impurity content and state scales with the variation of the parameters of precursor micro-and macroplastic flow. This strict correlation is universal for all published data on so-called ''brittle'' and ''ductile'' insulators, metals, superconductors and semiconductors, ceramics. It is explained by the universality of dislocation mechanisms. like double cross-slip and climb in different crystal classes at all stages of plastic deformation.