Back to Search Start Over

A critical discussion of elasto-visco-plastic self-consistent (EVPSC) models

Authors :
Bohye Jeon
Youngung Jeong
Carlos N. Tomé
Source :
Journal of Materials Research and Technology, Vol 33, Iss , Pp 7596-7609 (2024)
Publication Year :
2024
Publisher :
Elsevier, 2024.

Abstract

Two recently proposed elasto-visco-plastic self-consistent (EVPSC) models, based on solving for stress or stress increment, are discussed, and their results are compared with the ones of the visco-plastic self-consistent (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 predicted grain responses. To avoid such effect a method based on using two separate time increments is proposed, 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 reliable computations while preserving the computational efficiency of the elasto-visco-plastic model.

Details

Language :
English
ISSN :
22387854
Volume :
33
Issue :
7596-7609
Database :
Directory of Open Access Journals
Journal :
Journal of Materials Research and Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.2719fef9eb68440687713a1805b6d048
Document Type :
article
Full Text :
https://doi.org/10.1016/j.jmrt.2024.11.043