Formulation and characterization of a continuous crystal lattice orientation finite element method (LOFEM) and its application to dislocation fields
Abstract
We report that since the 1950s, a large body of work has been published on connecting the curvature of a crystal lattice to geometrically necessary dislocations densities of a crystal lattice. Studying dislocation transmission through grains and across their boundaries requires the lattice curvature to be preserved. However, traditional crystal plasticity models and their numerical implementations do not formally preserve lattice curvature. In this paper, a continuous crystal lattice orientation finite element method (LOFEM) is proposed to rectify this impediment to the inclusion of dislocation-based constitutive models. The methodology is first presented, and then it is demonstrated for tension and compression deformations of a copper polycrystal. It is shown that under the same deformation histories, the lattice continuity constraint alters the evolving state in comparison to the traditional approach, including retarding the rate at which the crystallographic texture strengthens under monotonic deformation. Lastly, taking advantage of the finite element representation of the lattice orientation, the Nye tensor is computed on lattices misoriented by deformation and is subsequently used to compute evolving dislocation density distributions.
- Authors:
-
- Cornell Univ., Ithaca, NY (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1497974
- Alternate Identifier(s):
- OSTI ID: 1547765
- Report Number(s):
- LLNL-JRNL-757791
Journal ID: ISSN 0022-5096; 945769
- Grant/Contract Number:
- AC52-07NA27344; SC0004913
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Mechanics and Physics of Solids
- Additional Journal Information:
- Journal Volume: 126; Journal Issue: C; Journal ID: ISSN 0022-5096
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Crystal lattice orientation; Crystal plasticity; Finite elements; Dislocations
Citation Formats
Carson, Robert, and Dawson, Paul. Formulation and characterization of a continuous crystal lattice orientation finite element method (LOFEM) and its application to dislocation fields. United States: N. p., 2019.
Web. doi:10.1016/j.jmps.2019.02.006.
Carson, Robert, & Dawson, Paul. Formulation and characterization of a continuous crystal lattice orientation finite element method (LOFEM) and its application to dislocation fields. United States. https://doi.org/10.1016/j.jmps.2019.02.006
Carson, Robert, and Dawson, Paul. Sun .
"Formulation and characterization of a continuous crystal lattice orientation finite element method (LOFEM) and its application to dislocation fields". United States. https://doi.org/10.1016/j.jmps.2019.02.006. https://www.osti.gov/servlets/purl/1497974.
@article{osti_1497974,
title = {Formulation and characterization of a continuous crystal lattice orientation finite element method (LOFEM) and its application to dislocation fields},
author = {Carson, Robert and Dawson, Paul},
abstractNote = {We report that since the 1950s, a large body of work has been published on connecting the curvature of a crystal lattice to geometrically necessary dislocations densities of a crystal lattice. Studying dislocation transmission through grains and across their boundaries requires the lattice curvature to be preserved. However, traditional crystal plasticity models and their numerical implementations do not formally preserve lattice curvature. In this paper, a continuous crystal lattice orientation finite element method (LOFEM) is proposed to rectify this impediment to the inclusion of dislocation-based constitutive models. The methodology is first presented, and then it is demonstrated for tension and compression deformations of a copper polycrystal. It is shown that under the same deformation histories, the lattice continuity constraint alters the evolving state in comparison to the traditional approach, including retarding the rate at which the crystallographic texture strengthens under monotonic deformation. Lastly, taking advantage of the finite element representation of the lattice orientation, the Nye tensor is computed on lattices misoriented by deformation and is subsequently used to compute evolving dislocation density distributions.},
doi = {10.1016/j.jmps.2019.02.006},
journal = {Journal of the Mechanics and Physics of Solids},
number = C,
volume = 126,
place = {United States},
year = {Sun Feb 10 00:00:00 EST 2019},
month = {Sun Feb 10 00:00:00 EST 2019}
}
Web of Science
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Works referencing / citing this record:
Estimation of Errors in Stress Distributions Computed in Finite Element Simulations of Polycrystals
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