TY  - CHAP
Y1  - 2011///
SP  - 1082
T2  - Computational plasticity XI : fundamentals and applications
A1  - Paggi, Marco
A1  - Wriggers, Peter
SN  - 978-84-89925-73-1
EP  - 1090
PB  - International center for numerical methods in engineering (CIMNE)
N1  - 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
UR  - http://eprints.imtlucca.it/2072/
N2  - 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.
KW  - Hierarchical materials; Polycrystalline materials; Imperfect interfaces; Cohesive zone models; Finite element method
AV  - none
ID  - eprints2072
TI  - Stiffness and strength of hierarchical polycrystalline materials with imperfect interfaces
ER  -