Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jmps.2012.01.005
Title: Phenomenological crystal plasticity modeling and detailed micromechanical investigations of pure magnesium
Authors: Zhang, J.
Joshi, S.P. 
Keywords: Constitutive laws
Micromechanics
Pure magnesium
Single crystal plasticity
Slip and twinning
Issue Date: May-2012
Source: Zhang, J., Joshi, S.P. (2012-05). Phenomenological crystal plasticity modeling and detailed micromechanical investigations of pure magnesium. Journal of the Mechanics and Physics of Solids 60 (5) : 945-972. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jmps.2012.01.005
Abstract: We present a single crystal plasticity model for pure Mg incorporating slip and deformation twinning. The model uses the basic framework of Kalidindi (1998), but proposes constitutive descriptions for the slip and twin evolution and their interactions that are motivated by experimental observations. Based on compelling experimental evidences, we distinguish between the constitutive descriptions of the tension and compression twinning to better represent their roles in the overall hardening of Mg single crystals. With these improved phenomenological descriptions, we first calibrate material parameters for the different slip and twin modes by performing three-dimensional simulations mimicking the plane-strain compression experiments by Kelley and Hosford (1967, 1968) on single crystal pure Mg. In doing so, these computational responses are critically compared with their corresponding orientation-dependent microscopic (slip and twin activities) and macroscopic (stressstrain responses) experimental observations. Then, the calibrated parameters are used to predict several other experimental results on pure single- and poly-crystal Mg under different loading conditions. We also investigate the role of pre-existing heterogeneities such as initial twin population and stiff, elastic inclusions on the single crystal macroscopic and microscopic responses. Microstructural characteristics show that such heterogeneities strongly influence the local and global evolution of the slip and twin activities, and in some cases modulate the strength anisotropy that is commonly observed in monolithic single crystals. These results may provide useful indicators toward designing novel composite Mg microstructures. © 2012 Elsevier Ltd. All rights reserved.
Source Title: Journal of the Mechanics and Physics of Solids
URI: http://scholarbank.nus.edu.sg/handle/10635/61102
ISSN: 00225096
DOI: 10.1016/j.jmps.2012.01.005
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

71
checked on Dec 7, 2017

WEB OF SCIENCETM
Citations

72
checked on Nov 23, 2017

Page view(s)

37
checked on Dec 11, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.