A crystal plasticity model for body-centered cubic molybdenum: Experiments and simulations

Daphalapurkar, Nitin Pandurang; Patil, Swapnil; Nguyen, Thao; Eswar Prasad, Korimilli; Ramesh, Kaliat

doi:10.1016/j.msea.2018.09.099

Title: A crystal plasticity model for body-centered cubic molybdenum: Experiments and simulations

Journal Article · Sat Sep 29 00:00:00 EDT 2018 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2018.09.099· OSTI ID:1477662

^[1]; Patil, Swapnil ^[2]; Nguyen, Thao ^[3]; Eswar Prasad, Korimilli ^[4]; Ramesh, Kaliat ^[5]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
General Electric Global Research Center, Bangalore (India)
Texas A & M Univ., College Station, TX (United States)
Indian Institute of Technology, Indore (India)
Johns Hopkins Univ., Baltimore, MD (United States)

Here, a physics-based finite strain crystal plasticity constitutive model for body-centered-cubic (BCC) single crystals is developed to capture the strong temperature, rate, and orientation dependence of mechanical behavior. The key features of the model include twinning-anti-twinning asymmetry of shearing resistance, a yield criterion that incorporates atomistics-informed non-Schmid effects, and a flow rule formulated based on the theory of thermally activated motion of screw dislocations via nucleation of double kinks. The implementation of the constitutive model in a finite-element program is briefly discussed. The material constants in the model are determined by calibrating the model against literature-based experimental data on single-crystal Molybdenum subjected to uniaxial compression and uniaxial tension. Experiments of uniaxial compression on a single crystal specimen with a hole were performed for validation of the calibrated model for BCC Molybdenum. Measurements of deformations in the vicinity of the hole were used to assess the ability of the model in predicting localized deformation patterns around the hole. Lastly, the model is able to effectively describe the anisotropic and temperature-dependent stress-strain response of a molybdenum crystal up to a homologous temperature of 0.3.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1477662

Report Number(s):: LA-UR-18-24093

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 738, Issue C; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Title: A crystal plasticity model for body-centered cubic molybdenum: Experiments and simulations

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