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A variational constitutive model for slip-twinning interactions in hcp metals: application to single- and polycrystalline magnesium

Chang, Yingrui and Kochmann, Dennis M. (2015) A variational constitutive model for slip-twinning interactions in hcp metals: application to single- and polycrystalline magnesium. International Journal of Plasticity, 73 . pp. 39-61. ISSN 0749-6419. http://resolver.caltech.edu/CaltechAUTHORS:20150602-100153291

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Abstract

We present a constitutive model for hcp metals which is based on variational constitutive updates of plastic slips and twin volume fractions and accounts for the related lattice reorientation mechanisms. The model is applied to single- and polycrystalline pure magnesium. We outline the finite-deformation plasticity model combining basal, pyramidal, and prismatic dislocation activity as well as a convexification-based approach for deformation twinning. A comparison with experimental data from single-crystal tension-compression experiments validates the model and serves for parameter identification. The extension to polycrystals via both Taylor-type modeling and finite element simulations shows a characteristic stress-strain response that agrees well with experimental observations for polycrystalline magnesium. The presented continuum model does not aim to represent the full details of individual twin-dislocation interactions; yet, it is sufficiently efficient to allow for finite element simulations while qualitatively capturing the underlying microstructural deformation mechanisms.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.ijplas.2015.03.008DOIArticle
http://www.sciencedirect.com/science/article/pii/S0749641915000637PublisherArticle
ORCID:
AuthorORCID
Kochmann, Dennis M.0000-0002-9112-6615
Additional Information:© 2015 Elsevier B.V. Received Date: 12 August 2014; Revised Date: 23 March 2015; Accepted Date: 25 March 2015; Available online 15 May 2015. This research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-12-2-0022. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Army Research LaboratoryW911NF-12-2-0022
Subject Keywords:plasticity, twinning, magnesium, polycrystal
Record Number:CaltechAUTHORS:20150602-100153291
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150602-100153291
Official Citation:Yingrui Chang, Dennis M. Kochmann, A variational constitutive model for slip-twinning interactions in hcp metals: Application to single- and polycrystalline magnesium, International Journal of Plasticity, Volume 73, October 2015, Pages 39-61, ISSN 0749-6419, http://dx.doi.org/10.1016/j.ijplas.2015.03.008. (http://www.sciencedirect.com/science/article/pii/S0749641915000637)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57933
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:02 Jun 2015 17:08
Last Modified:14 Sep 2016 00:01

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