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Theses

Propriétés effectives de matériaux architecturés

Abstract : Architectured materials bring new possibilities in terms of structural and functional properties, filling gaps and pushing the boundaries of Ashby's materials maps. The term "architectured materials" encompasses any microstructure designed in a thoughtful fashion, so that some of its materials properties have been improved. There are many examples: particulate and fibrous composites, foams, sandwich structures, woven materials, lattice structures, etc. One engineering challenge is to predict the effective properties of such materials. In this work, two types of microstructures are considered: periodic auxetic lattices and stochastic fibrous networks. Auxetics are materials with negative Poisson's ratio that have been engineered since the mid-1980s. Such materials have been expected to present enhanced mechanical properties such as shear modulus or indentation resistance. The stochastic fibrous networks considered in this work is made of 3D infinite interpenetrating fibres that are randomly distributed and oriented. This case of random structure is challenging regarding the determination of a volume element size that is statistically representative. For both materials, computational homogenization using finite element analysis is implemented in order to estimate the effective thermal and mechanical properties.
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  • HAL Id : pastel-00797363, version 1

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Justin Dirrenberger. Propriétés effectives de matériaux architecturés. Autre. Ecole Nationale Supérieure des Mines de Paris, 2012. Français. ⟨NNT : 2012ENMP0045⟩. ⟨pastel-00797363⟩

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