o:30592 Diffuse instability of slightly disordered quasi rate-independent anisotropic viscoplastic FCC-polycrystals en Abstract: Geometry and kinematics of intragranular as well as intergranular plastic deformation of polycrystals are briefly discussed. Elastic strain is covered by the effective medium homogenization method inside a representative volume element (RVE). Evolution equation formed by tensor representation is derived from very simple micro-evolution equation. It has an incremental quasi rate-independent (QRI) form obtained by Vakulenko’s concept of thermodynamic time. The rate dependence takes place by means of stress rate dependent value of the initial yield stress. In accordance with Zorawski’s communication about free macro rotations in intermediate reference configuration, strain geometry is based on constrained micro rotation within a representative volume element (RVE). The theory is applied to slightly disordered fcc-polycrystals. A comparison between QRI and classic diffuse instability equations is presented for transversely isotropic polycrystals. Keywords: Gradual instability, Anisotropy by damage plasticity, Eshelbian implants, Thermodynamic time 1552099 10.1016/j.prostr.2018.12.148 1552101 2452-3216 2023-08-16T12:44:29.627Z 44 no 46 Milan V. Mićunović Ljudmila T. Kudrjavceva Državni univerzitet u Novom Pazaru person 0000-0002-3396-5154 application/pdf 581300 https://phaidrabg.bg.ac.rs/o:30592 no yes 18 70 92000001 20A01 ECF22 - LOADING AND ENVIRONMENTAL EFFECTS ON STRUCTURAL INTEGRITY 13 2158 2163 2018