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Caractérisation des propriétés mécaniques et électriques des matériaux composites par méthode holographique numérique 3D et analyse diélectrique

Abstract : This PhD thesis describes the application of innovative analytical methods for the characterization of mechanicaland electrical properties of composite materials.The first chapter provides a state of the art of theoretical fundamentals and prerequisites needed to understandthe manuscript. A critical survey leads to a strategy for the analysis, based partly on digital holographic methodsand dielectric techniques.The second chapter is devoted to the choice of method of digital holography. In particular, this configurationshows some features that are analyzed in detail: the role of the aperture stop of the imaging system. We concludethat the Fresnel holography method has the advantage of achromatism for applications with multiplewavelengths.The third chapter presents two applications of digital holography control of composite structures with embeddedpiezoelectric patches dedicated to acoustic emission. We first demonstrate the possibility of analyzing thevibration behavior of composite beams using time averaged digital holography. Then, it was shown that thepellets used influence the mechanical behavior of materials under static conditions.Chapter 4 presents the experimental and numerical analysis of composite structures subjected to a shear test inclose three-point bending. We present the results obtained for samples with linen / flax and epoxy / carbon /epoxy.The last chapter deals with the analysis of the dielectric properties of composites reinforced with flax fibersstudied in the preceding chapter. We conclude that the flax fibers incorporated in the composite are lesshydrophilic than those incorporated with carbon fibers, which explains the improved adhesion fiber / matrix inthe first case.
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Submitted on : Thursday, February 21, 2013 - 5:18:16 PM
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  • HAL Id : tel-00793179, version 1

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Mayssa Karray. Caractérisation des propriétés mécaniques et électriques des matériaux composites par méthode holographique numérique 3D et analyse diélectrique. Autre [cond-mat.other]. Université du Maine, 2012. Français. ⟨NNT : 2012LEMA1019⟩. ⟨tel-00793179⟩

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