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Mechanical response of multicrystalline thin films in mesoscale field dislocation mechanics

Puri, Saurabh and Das, Amit and Acharya, Amit (2011) Mechanical response of multicrystalline thin films in mesoscale field dislocation mechanics. Journal of the Mechanics and Physics of Solids, 59 (11). pp. 2400-2417. ISSN 0022-5096. https://resolver.caltech.edu/CaltechAUTHORS:20111111-132318989

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Abstract

A continuum model of plasticity, Phenomenological Mesoscopic Field Dislocation Mechanics (PMFDM), is used to study the effect of surface passivation, grain orientation, grain boundary constraints, and film thickness on the mechanical response of multicrystalline thin films. The numerical experiments presented in this paper show that a surface passivation layer on thin films introduces thickness dependence of the mechanical response. However, the effect of passivation decreases in films with impenetrable grain boundaries. The orientation of individual grains of the multicrystal also has a significant effect on the mechanical response. Our results are in qualitative agreement with experimental observations. A primary contribution of this work is the implementation of a jump condition that enables the modeling of important limits of grain boundary constraints to plastic flow, independent of ad-hoc constitutive assumptions and interface conditions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.jmps.2011.06.009 DOIUNSPECIFIED
http://www.sciencedirect.com/science/article/pii/S0022509611001633PublisherUNSPECIFIED
Additional Information:© 2011 Elsevier Ltd. Received 6 September 2010; revised 14 June 2011; Accepted 15 June 2011. Available online 31 August 2011. Support from the National Science Foundation (Grant nos: DMI-0423304, DMR-0520425 CMU MRSEC), the US-ONR (Grant no. N000140910301), and the CMU Dowd-ICES Fellowship to SP is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
NSFDMI-0423304
NSFDMR-0520425 CMU MRSEC
Office of Naval Research (ONR)N000140910301
CMU Dowd-ICES FellowshipUNSPECIFIED
Subject Keywords:Dislocations; Grain boundaries; Plasticity; Finite elements; Microstructure
Issue or Number:11
Record Number:CaltechAUTHORS:20111111-132318989
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20111111-132318989
Official Citation:Saurabh Puri, Amit Das, Amit Acharya, Mechanical response of multicrystalline thin films in mesoscale field dislocation mechanics, Journal of the Mechanics and Physics of Solids, Volume 59, Issue 11, November 2011, Pages 2400-2417, ISSN 0022-5096, 10.1016/j.jmps.2011.06.009.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27753
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Nov 2011 18:52
Last Modified:03 Oct 2019 03:26

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