### Derivative criteria of plasticity anddurability of metal materials

Pages 39-47

Criteria of plasticity and durability derivative of standard indicators of plasticity (δ, ψ) and durability (σ

_{0,2}, σ

_{B}) are offered. Criteria К

_{δψ} and К

_{s} follow from the equation of relative indicators of durability and plasticity. The purpose of the researches is the establishment of interrelation of derivative criteria with the Page indicator. The values of derivative criteria were defined for steels 50X and 50XH after processing by cold, and also for steels 50G2 and 38HGN after sorbitizing. It was established that the sum of the offered derivative criteria of plasticity and durability С

_{к} considered for the steels is almost equal to unit and corresponds to a square root of relative durability and plasticity criterion C

^{0,5}. Both criteria testify to two-unity opposite processes of deformation and resistance to deformation. By means of the equations for S

_{к} and С it is possible to calculate an indicator of uniform plastic deformation of σ

_{р} and through it to estimate synergetic criteria - true tension and specific energy of deformation and destruction of metal materials. On the basis of the received results the expressions for assessing the uniform and concentrated components of plastic deformation are established. The preference of the dependence of uniform relative lengthening from a cubic root of criterion К

_{δψ}, and also to work of the criteria of relative lengthening and relative durability is given. The advantage of the formulas consists in simplicity and efficiency of calculation, in ensuring necessary accuracy of calculation of the size δ

_{р} for the subsequent calculation of structural and power (synergetic) criteria of reliability of metals.

DOI: 10.22227/1997-0935.2014.9.39-47

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