Stiffness and strength of hierarchical polycrystalline materials with imperfect interfaces
- verfasst von
- 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.
- Organisationseinheit(en)
-
Institut für Kontinuumsmechanik
- Typ
- Aufsatz in Konferenzband
- Seiten
- 1082-1091
- Anzahl der Seiten
- 10
- Publikationsdatum
- 12.2011
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Polymere und Kunststoffe
- Elektronische Version(en)
-
http://hdl.handle.net/2117/184143 (Zugang:
Offen)
http://edok01.tib.uni-hannover.de/edoks/e01mr01/805295720.pdf (Zugang: Offen)
