Nonlinear endochronic creep models taking into account the type of stress state

In the framework of the endochronic approach, two variants of the tensor-parametric nonlinear constitutive relations of the creep theory are proposed. These equations take into account the dependence of the materials behavior on the type of stress state, as well as large deformations and rotations. The constitutive equations of proposed models are applied to explain some effects in the classic creep. It is shown that the results of simulating of uniaxial isothermal creep are in agreement with experimental observations. Presented examples demonstrate the possibilities and a potential of the approach.