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Transition d’échelle entre fibre végétale et composite UD : propagation de la variabilité et des non-linéarités

Abstract : Although plant-fiber reinforced composites (PFCs) represent an attractive solution for the design of lightweight, high performance and low environmental cost structures, their development requires in-depth studies of the mechanisms underlying their nonlinear tensile behavior, as well as variability of mechanical properties. Given their multi-scale nature, this thesis aims to contribute, using a numerical approach, to the study of the propagation of behavior across the scales of PFCs. Firstly, the study focuses on the fiber scale: a 3D model of the behavior of the wall is first implemented in an EF calculation, in order to establish the influence of fiber morphology on the tensile behavior. Once the non-negligible impact of the morphology has been determined, a study of the links between morphology, material and ultrastructure and tensile behavior is conducted via a sensitivity analysis in the case of flax and hemp. The second part of the work is dedicated to the composite ply scale. A new stochastic multi-scale approach is developed and implemented. It is based on the definition of an elementary volume (VE) with random microstructure to describe the behavior of the ply. The approach is then used to study the sensitivity of VE behavior to nano, micro and mesoscopic parameters. Sensitivity analysis, conducted via the development of the response on the basis of polynomial chaos, allows us to construct a metamodel of the tensile behavior of the ply.
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  • HAL Id : tel-02000991, version 1

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Alessandra del Masto. Transition d’échelle entre fibre végétale et composite UD : propagation de la variabilité et des non-linéarités. Science des matériaux [cond-mat.mtrl-sci]. Université Bourgogne Franche-Comté, 2018. Français. ⟨NNT : 2018UBFCD022⟩. ⟨tel-02000991⟩

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