Relationship between stresses and strains over a period with isothermal uniaxial loads

Conclusions

• 1. The set of characteristic Eqs. (1), obtained on the basis of separating stresses into equilibrium and nonequilibrium components using fundamental laws of thermodynamics and taking account of deformation phenomena for a solid, describe the state of an isothermally deformed metal specimen for all possible cases of uniaxial loading.

• 2. Particular cases of characteristic Eqs. (1) permitting their integration with appropriate initial conditions have been considered. Solutions obtained for test cases of loading on alloy KhN70VMYuT and copper M1 give results close to experimental data. This points to the suitability of thermomechanical deformation entropy theory [1] for practical calculations of the relationship between stresses and strains over a period of time with isothermal uniaxial loading of specific materials. However, the set of basic experiments formulated, on whose basis coefficients for the characteristic equations were calculated, only makes it possible to describe processes deviating very little from the basic processes, and this significantly limits the area of reliability for these equations.