Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
