Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 61, Issue 9, Pages 1935-1954Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2013.04.007
Keywords
Strain gradient; Crystal plasticity; Micropolar; Geometrically necessary dislocations; Discrete dislocation dynamics; Thin films
Funding
- Sandia National Laboratories through the Enabling Predictive Simulation Research Institute (EPSRI)
- Laboratory Directed Research and Development program
- U.S. Department of Energy's National Nuclear Security Administration under DOE [DE-AC04-94AL85000]
- Los Alamos National Security LLC under DOE [DE-AC52-06NA25936]
- NSF CMMI [1030103]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1030103] Funding Source: National Science Foundation
Ask authors/readers for more resources
An evaluation of different dislocation density-based strength models for a theory of micropolar single crystal plasticity is presented through detailed comparison with discrete dislocation dynamics simulations of a constrained thin film subjected to simple shear. The principal component of the evaluation is determining the most appropriate way to incorporate scale-dependent strengthening due to geometrically necessary dislocations (GNDs) within the model. We find that some models give results consistent with the discrete dislocation simulations, yet it is shown that models based on a generalized Taylor relation do not. Additionally, we briefly discuss the differences between models derived from unified (single) and independent (multiple) flow criteria, and demonstrate that single criterion models provide comparable predictive capability while introducing fewer nonlocal constitutive parameters. Published by Elsevier Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available