Abstract
The second coefficient of the Mott—Stroh type equation is considered as the stress intensity factor in a microcrack edge under external cyclic stresses and internal ones. The individual length of a critical microcrack is defined more exactly for some dispersion-hardened materials relatively to their average value. The experimental equations for dependences of a limit of strength and yield point in three groups of the materials in question are analyzed using structure parameters in two levels.
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