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Contribution à l'étude de la propagation et de l'atténuation des ondes guidées dans les laminés composites anisotropes constitués de matériaux composites viscoélastiques : Application à des pièces de nacelle de l'A380

Abstract : Anisotropic composite plates made up of viscoelastic composite materials are increasingly used in aeronautic industry and structural health monitoring strategies based on guided waves appear as a very promising tool to monitor their health state. In that context, this work is dedicated to the study of guided waves propagation and attenuation in such composite plates. Classical equations of guided waves propagating in a single layer elastic plate are first reviewed based on the three-dimensional (3D) elasticity theory and form the foundation of the partial wave superposition approach (PWSA). In the literature, this approach has been extended to the transfer matrix method (TMM) and global matrix method (GMM) allowing to express the wave propagation characteristics in elastic composite plates. Due to anisotropy, matrix incompatibility issues are encountered when dealing with arbitrarily orientated composite plates for TMM and GMM. An original hybrid matrix strategy (HMS) is proposed to alleviate this issue. It is furthermore demonstrated that dispersion equations built with PWSA for a single layer plate and with TMM and GMM for a multi-layered plate system possess a dichotomy property in the case of pure elastic materials. This property states that these a priori complex-valued equations collapse to pure real or imaginary valued equations, depending on the behavior of some intermediate parameters. This is extremely helpful for overcoming numerical instabilities encountered during the equation solving process. The elastic case is then extended to the viscoelastic case by introducing viscoelastic damping models (Hysteretic, Kelvin-Voigt and Biot models) in composite materials dynamical behavior. This forms the damped GMM (dGMM) proposed here to deal with composite plates made up of arbitrarily orientated anisotropic viscoelastic composite materials. Two industrial case studies, a fan cowl structure (FCS) and an inner fixed structure (IFS) both which are components of an A380 nacelle, are employed to experimentally validate the dGMM by comparing the accuracy of dGMM predictions in terms of velocities and attenuation to experimental measurements.
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Submitted on : Wednesday, June 29, 2022 - 3:39:22 PM
Last modification on : Wednesday, September 28, 2022 - 5:55:34 AM

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  • HAL Id : tel-03709032, version 1

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Shuanglin Guo. Contribution à l'étude de la propagation et de l'atténuation des ondes guidées dans les laminés composites anisotropes constitués de matériaux composites viscoélastiques : Application à des pièces de nacelle de l'A380. Mécanique des matériaux [physics.class-ph]. HESAM Université, 2021. Français. ⟨NNT : 2021HESAE079⟩. ⟨tel-03709032⟩

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