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Theses

Etude multi-échelles et multiphysiques des mécanismes de fissuration dans les matériaux à base de fibres naturelles

Abstract : Materials made up of synthetic or natural fibres are increasingly developed in various domains: papermaking, composite, automotive and aeronautic industries for structural, packaging, air filtration or medical applications. Despite the variety of manufacturing processes of such materials, all of them can be considered as being formed by a network of fibres interconnected via bonds. For instance, in the case of materials made up of natural cellulosic fibres such as papers or boards, fibres are chemically linked.Crack propagation phenomena in such materials remain poorly understood even though it can be presumed that such mechanisms depend on:-(i) the geometrical and mechanical properties of the constituents of individual fibres and fibre-fibre bonds,-(ii) the architecture of the fibrous network, for example the spatial distributions of fibres, bonds and pores and the size distributions of pores and bonds,-(iii) the applied mechanical loadings.In such materials, scale effects must be investigated in order to improve the classical approaches used to understand crack propagation mechanisms. Recent progresses in both experimental mechanics and numerical simulation approaches allow such a study from the fibre scale up to the fibre network scale to be carried out.The proposed PhD aims first at developing an original experimental approach to analyse microstructure changes and crack propagation phenomena for low density papers. For that purpose x-ray microtomography or ESEM, and stereo-correlation experiments will be carried out to investigate microstructural changes and deformation mechanisms at all relevant scales (see the illustration given in ).
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https://tel.archives-ouvertes.fr/tel-01688631
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Submitted on : Friday, January 19, 2018 - 3:35:08 PM
Last modification on : Friday, November 20, 2020 - 12:54:03 PM

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KRASNOSHLYK_2017_diffusion.pdf
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  • HAL Id : tel-01688631, version 1

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STAR | CNRS | LGP2 | 3S-R | UGA

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Victoria Krasnoshlyk. Etude multi-échelles et multiphysiques des mécanismes de fissuration dans les matériaux à base de fibres naturelles. Matériaux. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAI028⟩. ⟨tel-01688631⟩

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