Stiffness and strength of hierarchical polycrystalline materials with imperfect interfaces

authored by: Marco Paggi, Peter Wriggers
Abstract: 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.
Organisation(s): Institute of Continuum Mechanics
Type: Conference contribution
Pages: 1082-1091
No. of pages: 10
Publication date: 12.2011
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Polymers and Plastics
Electronic version(s): http://hdl.handle.net/2117/184143 (Access: Open)
http://edok01.tib.uni-hannover.de/edoks/e01mr01/805295720.pdf (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{c1a53537a3d34305967c0f1610d590be,
title = "Stiffness and strength of hierarchical polycrystalline materials with imperfect interfaces",
abstract = "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.",
keywords = "Cohesive zone models, Finite element method, Hierarchical materials, Imperfect interfaces, Polycrystalline materials",
author = "Marco Paggi and Peter Wriggers",
year = "2011",
month = dec,
language = "English",
isbn = "9788489925731",
pages = "1082--1091",
editor = "E. O{\~n}ate and D.R.J. Owen and D. Peric and B. Su{\'a}rez",
booktitle = "Computational Plasticity XI",
publisher = "International Centre for Numerical Methods in Engineering, CIMNE",
edition = "First edition",
note = "11th International Conference on Computational Plasticity, COMPLAS XI ; Conference date: 07-09-2011 Through 09-09-2011",
}