Mechanical failure in microstructural heterogeneous materials

Stéphane Bordas, R. H W Hoppe, Svetozara I. Petrova

Research output: Chapter in Book/Conference paperConference paper

2 Citations (Scopus)

Abstract

Various heterogeneous materials with multiple scales and multiple phases in the microstructure have been produced in the recent years. We consider a mechanical failure due to the initiation and propagation of cracks in places of high pore density in the microstructures. A multi-scale method based on the asymptotic homogenization theory together with the mesh superposition method (s-version of FEM) is presented for modeling of cracks. The homogenization approach is used on the global domain excluding the vicinity of the crack where the periodicity of the microstructures is lost and this approach fails. The multiple scale method relies on efficient combination of both macroscopic and microscopic models. The mesh superposition method uses two independent (global and local) finite element meshes and the concept of superposing the local mesh onto the global continuous mesh in such a way that both meshes not necessarily coincide. The homogenized material model is considered on the global mesh while the crack is analyzed in the local domain (patch) which allows to have an arbitrary geometry with respect to the underlying global finite elements. Numerical experiments for biomorphic cellular ceramics with porous microstructures produced from natural wood are presented.

Original languageEnglish
Title of host publicationNumerical Methods and Applications - 6th International Conference, NMA 2006, Revised Papers
Pages533-541
Number of pages9
Volume4310 LNCS
Publication statusPublished - 2007
Externally publishedYes
Event6th International Conference on Numerical Methods and Applications, NMA 2006 - Borovets, Bulgaria
Duration: 20 Aug 200624 Aug 2006

Conference

Conference6th International Conference on Numerical Methods and Applications, NMA 2006
CountryBulgaria
CityBorovets
Period20/08/0624/08/06

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  • Cite this

    Bordas, S., Hoppe, R. H. W., & Petrova, S. I. (2007). Mechanical failure in microstructural heterogeneous materials. In Numerical Methods and Applications - 6th International Conference, NMA 2006, Revised Papers (Vol. 4310 LNCS, pp. 533-541)