Contribution à l'étude du vieillissement couplé thermo-hydro-mécanique de biocomposite PLA/lin

Abstract : The growing demand for bio-based composites intended for high standard applications bring to light the specific problems of aging prediction in real life conditions. The various environment in which these products are likely to be used lead to different kinds of damage (hydric, thermal and mechanical). The complex behavior of each component (fiber, matrix, and even their interface), and thus the behavior of the composite material, are generally poorly understood.The objective of this work is to provide possible answers to these inter-related problems by studying, extit{ex situ} and extit{in situ}, the behavior of PLA/flax biocomposites subjected to a coupled thermo-hydro-mechanical aging. The influence of the presence or the absence of water at different temperatures coupled to a creep stress was assessed for different fiber contents.At first, the characterization of these biocomposites in a thermo-hydric environment allowed to identify the involved phenomena. Several physical, chemical and mechanical properties were determined during diffusion. Then, the irreversible consequences of thermo-hydric aging on these properties were assessed. Thirdly, the subjection of materials to additional mechanical loadings made possible the evaluation of the effects of thermo-hydro-mechanical couplings. Finally, a finite element model was established in order to simulate the physical and mechanical behavior of biocomposites in a given thermo-hydric environment.
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Arnaud Regazzi. Contribution à l'étude du vieillissement couplé thermo-hydro-mécanique de biocomposite PLA/lin. Autre. Ecole Nationale Supérieure des Mines de Paris, 2013. Français. ⟨NNT : 2013ENMP0050⟩. ⟨pastel-00958086⟩

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