A critical discussion of elasto-visco-plastic self-consistent (EVPSC) models
Year: 2024
Type: article
Abstract: Two recently proposed elasto-visco-plastic (EVPSC) models, based on solving for stress or stress increment, are discussed, and their results are compared with the ones of the visco-plastic VPSC approach. The advantages and shortcomings of the models are demonstrated, with emphasis on how the grain responses are affected by the time increment and inclusion-medium interaction strength used. Experimental data obtained for an FCC stainless steel is used as the benchmark system for performing the simulations and assessing the reliability of the results. Predictions of stress-strain response of the aggregate, standard deviations in intergranular stress and strain rate, along with the evolution of internal lattice strain are presented and compared, with special focus on their dependence on the incremental approach chosen. We find that the chosen time increment may significantly affect grain responses. To avoid the effect of time increment in the results we propose a method based on using two separate time increments, one for approximating the stress rate and another for actual integration of stress, strain, and state variables. The proposed method successfully eliminates the dependence of results on the time increment used, thus allowing more flexible computations while preserving the computational efficiency of the elasto-visco-plastic model.
Authors: Bohye Jeon, Youngung Jeong, Carlos N. Tomé
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,430
Awards: G3108741604, G7347992600, G8628045242
OpenAlex ID: W4404094528