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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5417
Title: A nonequilibrium thermodynamic model for viscoplasticity coupled with damage for BCC metals
Authors: Kar G.
Roy Chowdhury, Shubhankar
Roy D.
Published in: Mechanics of Advanced Materials and Structures
Abstract: We present a physically enhanced ductile damage model applicable for body centered cubic (BCC) metals. The current proposition extends the authors’ recent work on thermo-viscoplasticity based on two-temperature thermodynamics and physics of disparate types of dislocation densities. The description of the thermodynamic system involves primarily two types of variables (or degrees of freedom, DOFs) representing several micro/meso-scopic processes occurring in two separable time-scales during ductile damage. Processes of rearrangement and movement of defects, namely dislocations, voids, micro-cracks, take place in a time scale much slower than that of the vibration of atoms about their equilibrium positions in the lattice. Consequently, they appear in the thermodynamic theory in terms of slow configurational DOFs and the fast kinetic vibrational DOFs respectively. While we consider physics based internal variables, e.g., mobile and forest dislocation densities, for modeling viscoplasticity alone, material degradation due to ductile damage is treated in a phenomenological fashion taking recourse to the framework of continuum damage mechanics. In order to assess the performance of our proposal, numerical experiments on boundary value problems of viscoplasticity with or without damage are carried out and validated against available experimental evidence. © 2020, © 2020 Taylor & Francis Group, LLC.
Citation: Mechanics of Advanced Materials and Structures(2020), 27(13): 1110-1119
URI: https://doi.org/10.1080/15376494.2020.1717692
http://repository.iitr.ac.in/handle/123456789/5417
Issue Date: 2020
Publisher: Taylor and Francis Inc.
Keywords: ductile damage
kinetic-vibrational and configurational subsystems
mobile and forest dislocations
Two-temperature thermodynamics
ISSN: 15376494
Author Scopus IDs: 57191668222
56818427600
7402439420
Author Affiliations: Kar, G., Computational Mechanics Lab, Department of Civil Engineering, Indian Institute of Science, Bangalore, India, Centre of Excellence in Advanced Mechanics of Materials, Indian Institute of Science, Bangalore, India
Roy Chowdhury, S., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, India
Roy, D., Computational Mechanics Lab, Department of Civil Engineering, Indian Institute of Science, Bangalore, India, Centre of Excellence in Advanced Mechanics of Materials, Indian Institute of Science, Bangalore, India
Funding Details: This work was supported by Defense Research and Development Organization, Government of India under Grant No. DRDO/0642.
Corresponding Author: Roy, D.; Computational Mechanics Lab, Department of Civil Engineering, Indian Institute of ScienceIndia; email: royd@iisc.ac.in
Appears in Collections:Journal Publications [CE]

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