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Stiffness and strength of hierarchical polycrystalline materials with imperfect interfaces

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)

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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.

Item Type: Book Section
Additional Information: Volumen containing the full length papers accepted for presentation at the XI International Conference on Computational Plasticity. Fundamentals and Applications Barcelona, Spain, 07-09 September 2011
Uncontrolled Keywords: Hierarchical materials; Polycrystalline materials; Imperfect interfaces; Cohesive zone models; Finite element method
Subjects: T Technology > TJ Mechanical engineering and machinery
Research Area: Computer Science and Applications
Depositing User: Prof Marco Paggi
Date Deposited: 16 Dec 2013 14:00
Last Modified: 09 Oct 2014 09:20
URI: http://eprints.imtlucca.it/id/eprint/2072

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