Etudes multi-échelles des couplages entre les propriétés hygroélastiques des papiers et leur microstructure

Abstract : The objective of this work is to study the coupling between the hygroelastic properties ofpapers and their microstructure. The use of images of models acquired by X-ray microtomographypapers allowed the characterization in an unprecedentedmanner of the evolutionofmicrostructural properties of thesematerials according to their production conditions andduring tests where they were placed in atmosphere at controlled relative humidity. These resultsprovide a new contribution to the knowledge of the statistical nature of the descriptorsof fibre properties (size and orientation) and their contacts (surface, bonding degree ratio), ofthe architecture of fibrous networks that papers constitute (number of fibre-to-fibre bonds)as well as of the size of the representative elementary volumes of microstructural and elasticproperties. Based on this information, various models, more or less sophisticated, were developedin the framework of the theory of homogenisation of discrete periodic structures todescribe the mechanical properties of paper. This approach sheds new light on the role offibre-to-fibre bonds on themechanical behaviour of thesematerials.
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Cyril Marulier. Etudes multi-échelles des couplages entre les propriétés hygroélastiques des papiers et leur microstructure. Génie des procédés. Université de Grenoble, 2013. Français. ⟨NNT : 2013GRENI090⟩. ⟨tel-01204796⟩



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