Please use this identifier to cite or link to this item:
Title: An enhanced continuum model for size-dependent strengthening and failure of particle-reinforced composites
Authors: Suh, Y.S.
Joshi, S.P. 
Ramesh, K.T.
Keywords: Enhanced continuum model
Geometrically necessary dislocations
Interface failure
Particle-reinforced composites
Punched zone
Issue Date: Nov-2009
Source: Suh, Y.S., Joshi, S.P., Ramesh, K.T. (2009-11). An enhanced continuum model for size-dependent strengthening and failure of particle-reinforced composites. Acta Materialia 57 (19) : 5848-5861. ScholarBank@NUS Repository.
Abstract: We present an enhanced continuum model for the size-dependent strengthening and failure of particle-reinforced composites. The model accounts explicitly for the enhanced strength in a discretely defined "punched zone" around the particle in a metal matrix composite as a result of geometrically necessary dislocations developed through a mismatch in the coefficients of thermal expansion. We incorporate the punched zone explicitly through a unit-cell model within this work, but the approach can be used more generally to account for discrete particle distributions and particle shapes. Smaller particles lead to greater strengthening, and this size effect is larger for larger volume fractions. An equation for the coupling of the size-dependent increase of yield strength of metal matrix composites with the particle volume fraction is obtained. The results indicate that the punched zone effect may amplify the occurrence of a variety of failure modes such as matrix localization, particle fracture and/or particle-matrix interface failure; smaller particles perceive higher stresses. We account for interface failure through a cohesive approach, and show that the interface damage mechanism is also particle-size-dependent. Some implications are presented for microstructural design of metal matrix composites. © 2009 Acta Materialia Inc.
Source Title: Acta Materialia
ISSN: 13596454
DOI: 10.1016/j.actamat.2009.08.010
Appears in Collections:Staff Publications

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


checked on Mar 5, 2018


checked on Mar 5, 2018

Page view(s)

checked on Feb 25, 2018

Google ScholarTM



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