MODELING THE NON-ISOTHERMAL CYCLIC DEFORMATION CURVE

Abstract

The three-parameter model designed for modeling the behavior of elastoplastic materials under cyclic loading for constant temperatures is generalized for the case of non-isothermal loading. The half-cycle variation of Bauschinger effect, of the non-linear part of the deformation curve and of Young's modulus as a function of temperature and plastic strain are accounted for. The notion of thermal-mechanic surface is generalized for the case of cyclic deformation for constructing the deformation curve of a material under non-isothermal cyclic loading. The cyclic elastoplastic deformation loops constructed using the model are compared with the experimental data for a nickel alloy under hard loading and exposure to high temperatures.

Keywords: plasticity, cyclic loading, non-isothermal conditions, thermo-mechanic surface.