relation: http://eprints.imtlucca.it/2072/
title: Stiffness and strength of hierarchical polycrystalline materials with imperfect interfaces
creator: Paggi, Marco
creator: Wriggers, Peter
subject: TJ Mechanical engineering and machinery
description: In this paper, considering a cohesive zone model (CZM) for finite thickness  interfaces recently proposed by the authors, the stiffness of polycrystalline materials with  imperfect interfaces is characterized. Generalized expressions for the Voigt and Reuss  estimates of the effective elastic modulus of the composite are derived to interpret the  numerical results. Considering a polycrystalline material with a hierarchical microstructure,  the interaction between interfaces at the different hierarchical levels is numerically  investigated. A condition for scale separation, which suggests how to design the optimal  microstructure to maximize the material tensile strength is determined. An original interpretation  of this phenomenon based on the concept of flaw tolerance is finally proposed.
publisher: International center for numerical methods in engineering (CIMNE)
date: 2011
type: Book Section
type: PeerReviewed
identifier:   Paggi, Marco and Wriggers, Peter  Stiffness and strength of hierarchical polycrystalline materials with imperfect interfaces.   In:  Computational plasticity XI : fundamentals and applications.   International center for numerical methods in engineering (CIMNE), pp. 1082-1090.  ISBN 978-84-89925-73-1      (2011)