A Variant of the Strain-Hardening Theory Allowing for the Stress and Temperature Dependence of Parameters in Constitutive Equations

A procedure is put forward for concrete definition of constitutive relationships of the strain-hardening theory allowing for the level of damage in a material. The parameters of the equation of creep and the damage evolution relationship are assumed to be functions of stress and temperature. Efficiency of this approach is illustrated by describing creep curves for 20Kh13 and EP44 steels over a fairly wide range of stress variation.__________Translated from Problemy Prochnosti, No. 2, pp. 19 – 27, March – April, 2005.