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A multiplicative plastic hardening model in consideration of strain softening and strain rate: theoretical derivation and characterization of model parameters with simple tension and creep test
journal contribution
posted on 2020-12-01, 00:00 authored by H Kim, Jeong YoonJeong Yoon, K Chung, M G LeeHardening behavior with its ultimate deterioration (or softening) after uniform deformation limit and strain rate sensitivity of metals at elevated temperatures are characterized. To avoid non-uniqueness in the identification procedure based on only simple tension test, an inverse identification procedure involving not only the simple tension test, but also the creep test is newly proposed. Moreover, for better understanding of creep behavior, analytical and numerical creep models are developed for the generalized multiplicative constitutive law accounting for hardening, softening, and strain rate sensitivity. Robust parametric studies are presented to explore the effect of material and process parameters on creep deformation behavior, which is also effectively used for the two-step characterization procedure of the proposed hardening model. The identification procedure for the multiplicative constitutive model is demonstrated using AZ61 Mg alloy sheet, which provides good correlations between calculated and measured stress-strain curves and creep strains under different strain rates and prior-creep strains.
History
Journal
International journal of mechanical sciencesVolume
187Article number
105913Pagination
1 - 20Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0020-7403Language
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
Keywords
Hardening deteriorationSofteningCreep testStrain rate sensitivityInverse identificationMagnesium alloysScience & TechnologyTechnologyEngineering, MechanicalMechanicsEngineeringVISCOPLASTIC CONSTITUTIVE MODELDUCTILE ANISOTROPIC SHEETSNONASSOCIATED FLOW RULEFORMING LIMIT CRITERIONDYNAMIC RECRYSTALLIZATIONRATE SENSITIVITYHIGH-TEMPERATURESTEEL SHEETSALLOY SHEETWIDE-RANGEMechanical Engineering
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