Two-temperature thermodynamics and a viscoplasticity model for FCC metals with grain boundary effect

Kar, G and Tiwari, SB and Gundi, SR and Roy, D (2023) Two-temperature thermodynamics and a viscoplasticity model for FCC metals with grain boundary effect. In: Mechanics of Materials, 177 .

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Abstract

A non-equilibrium thermodynamic route is pursued to model viscoplasticity, including the evolving grain boundary, in face-centered cubic (FCC) metals. The thermodynamic description includes two subsystems: the configurational subsystem describing the relatively slower motion of dislocations and grain boundaries, and a fast-evolving kinetic-vibrational (K-V) subsystem depicting atomic vibrations about equilibrium positions in the lattice. Grain boundary and dislocation densities as well as their interactions are incorporated within the model. The model is initially developed for homogeneous plastic deformation, which is then generalized to the inhomogeneous case via spatial variations in the thermodynamic states over a wide range of strain rate and temperature. The model is implemented as a user material subroutine (VUMAT) in ABAQUS to simulate a problem of industrial interest, viz. deep drawing on an AA 7075 aluminum alloy. Finally, the thermo-viscoplasticity model is used to predict negative strain rate sensitivity in the AA 2219 aluminum alloy at room temperature, for which an experiment is performed at a facility of the VSSC. The predictive quality of the model is demonstrated by a comparison of numerical simulations with the experimental evidence. © 2022 Elsevier Ltd

Item Type:	Journal Article
Publication:	Mechanics of Materials
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier.
Keywords:	Aluminum alloys; Lattice vibrations; Plasticity; Strain rate; Temperature, Dislocations densities; Face-centered cubic metals; Grain boundary densities; Grain boundary effects; Grain-boundaries; Kinetic-vibrational and configurational subsystem; Non equilibrium thermodynamics; Two-temperature thermodynamic; Viscoplastic deformation; Viscoplasticity models, Grain boundaries
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	24 Jan 2023 12:15
Last Modified:	24 Jan 2023 12:15
URI:	https://eprints.iisc.ac.in/id/eprint/79479

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