Microstructural models of multi-mechanisms of inelastic deformation: basic equations and application examples

Author details
  • Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russian Federation
  • Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russian Federation
  • Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russian Federation

Abstract

By analogy with phenomenological models of multi-mechanisms of inelastic deformation, microstructural models of multi-mechanisms are proposed to describe the behavior of single-crystal and polycrystalline materials. Along with the general formalism for accounting for the mutual influence of various deformation and hardening mechanisms, two simplified versions of the theory are considered in detail: (i) multiphase models without taking into account the mutual influence of hardening mechanisms, (ii) single-phase models taking into account the mutual influence of hardening mechanisms. The proposed models take into account various slip systems, the presence of linear and nonlinear isotropic and kinematic hardening, and use various scalar internal variables to describe them. Both two-term and three-term laws of evolution of internal variables are considered, ensuring the presence of both a horizontal asymptote on the strain-stress curve and an inclined one corresponding to asymptotic linear hardening. The thermodynamic consistency of the models under consideration is investigated. The results of verification of the proposed model and methods for identifying material parameters are presented.

Keywords

crystal plasticity and viscoplasticitymicromechanical modelsoctahedral slip systemscubic slip systemscrystallographic orientation.

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Article information

Published
17 December 2025
Issue date
17 December 2025
Issue
No. 5 (2025)
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