Stress and strain relaxation in magnesium AZ31 rolled plate: In-situ neutron measurement and elastic viscoplastic polycrystal modeling

Wang, Huamiao; Clausen, Bjorn; Capolungo, Laurent; Beyerlein, Irene Jane; Wang, Jian; Tome, Carlos N.

doi:10.1016/j.ijplas.2015.07.004

Stress and strain relaxation in magnesium AZ31 rolled plate: In-situ neutron measurement and elastic viscoplastic polycrystal modeling

Journal Article · Thu Jul 16 00:00:00 EDT 2015 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2015.07.004· OSTI ID:1329678

Wang, Huamiao ^[1]; Clausen, Bjorn ^[1]; Capolungo, Laurent ^[2]; Beyerlein, Irene Jane ^[1]; Wang, Jian ^[1]; Tome, Carlos N. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Georgia Inst. of Technology, Atlanta, GA (United States); Georgia Tech-CNRS, Metz (France)

Continuous mechanical tests with strain holds (stress relaxation) and with stress holds (strain relaxation) are performed simultaneously with in-situ neutron measurements to analyze the mechanisms of stress and strain relaxation in Mg AZ31 rolled plate. A dislocation activity based constitutive model, accounting for internal stress statistical distributions, is proposed and implemented into an elastic viscoplastic self-consistent (EVPSC) framework to simultaneously describe both stress and strain relaxation. The model captures the experimental data in terms of macroscopic stress strain curves, evolution of stress and strain during holding, as well as evolution of the internal elastic strains. Model results indicate that the magnitude of the stress relaxed during strain holding is dependent on both, the magnitude of the flow stress and the spread of the resolved shear stress distribution. The magnitude of strain accumulated during stress holding is, on the other hand, dependent on the magnitude of the hardening rate and on the spread of the resolved shear stress distribution. Furthermore, the internal elastic strains are directly correlated with the stress state, and hence the stress relaxation during strain holds has a greater influence on the lattice strains than strain relaxation during stress holds.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1329678

Alternate ID(s):: OSTI ID: 1252024

Report Number(s):: LA-UR--15-23052

Journal Information:: International Journal of Plasticity, Journal Name: International Journal of Plasticity Journal Issue: C Vol. 79; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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