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Comportement piézorésistif de composites à matrice élastomère renforcée par des nanotubes de carbone

Abstract : The objectives of the thesis are to characterize and model the piezoresistive behavior of carbon nanotubes elastomeric composites under quasi-static and dynamic compression. This work was supported by the CLEBER project partners: the Gabriel Lamé laboratory and ATCOM Télémétrie. In particular, we have sought the microstructural mechanisms at the origin of the piezoresistive behavior of such composites. An increase of the electrical resistance was observed under quasi-static compression forces. This behavior is attributed to reorientations of the CNT network during the test, leading to an increase of the distances between CNT. Furthermore, the carbon nanotube weight fraction was related to the electrical sensitivity of the composites. Dynamic compression tests were carried out on a Split Hopkinson Pressure Bars apparatus. High strain rates in these tests cause damage of the composites, characterized by a dramatic increase in the electrical resistance and a loss in the elastic modulus. To model the piezoresistive behavior, the carbon nanotube network is described by a resistor network representation. The change of the conductive network, i.e. movements of carbon nanotubes, is determined using simulations on the LS-Dyna finite element code. A decoupling hypothesis between the matrix and the carbon nanotubes is used to compute the displacements of the carbon nanotubes.
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Submitted on : Monday, June 8, 2020 - 9:49:16 AM
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Nicolas Penvern. Comportement piézorésistif de composites à matrice élastomère renforcée par des nanotubes de carbone. Mécanique des matériaux [physics.class-ph]. Université d'Orléans, 2020. Français. ⟨tel-02859876⟩

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