Caractérisation de l'endommagement de matériaux composites stratifiés à l'aide de la mesure du déplacement par une méthode optique plein-champ

Abstract : This work results from a collaboration between Pr Ayadi (Institut Polytechnique de Lorraine) and Pr Varna (Technical University of Luleå). Since 2005, Pr Varna has developed an original method that allows for the determination of all the thermoelastic constants of a damaged laminate. The stiffness reduction is governed by two parameters: the average value of the opening and the average value of the sliding of the crack surfaces. These values are normalized with respect to the applied loading. In this work, the potential of speckle interferometry is analysed to obtain these two parameters. More generally, we show the usefulness of displacement field measurements to characterize damage development in laminates. The first chapter is dedicated to the damage that occurs in laminates. The main objective is to highlight the points for which displacement field measurements could bring interesting information. In the second chapter, the principle of speckle interferometry is described. The choice of this technique for the considered application is discussed and justified. In the third chapter, an experimental study of the potential of speckle interferometry is proposed to characterize the damage forms that occur in a glass/epoxy laminate. In the last chapter, the development of damage is experimentally analysed in a carbon/epoxy laminate
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Laurent Farge. Caractérisation de l'endommagement de matériaux composites stratifiés à l'aide de la mesure du déplacement par une méthode optique plein-champ. Autre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL052N⟩. ⟨tel-01748768⟩

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