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

Journal Article · · Journal of Materials Research and Technology
 [1];  [2];  [3]
  1. Changwon National University (Korea, Republic of); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. Changwon National University (Korea, Republic of)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
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.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Ministry of Trade, Industry and Energy (MOTIE); National Research Foundation of Korea (NRF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2476429
Alternate ID(s):
OSTI ID: 2481571
Report Number(s):
LA-UR--24-30123
Journal Information:
Journal of Materials Research and Technology, Journal Name: Journal of Materials Research and Technology Vol. 33; ISSN 2238-7854
Publisher:
Brazilian Metallurgical, Materials and Mining AssociationCopyright Statement
Country of Publication:
United States
Language:
English

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