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Détection et quantification operando de l'endommagement dans les composants automobiles en composite polyamide/renfort continu soumis à la fatigue-pré et/ou post impact par les techniques ultrasonores avancées

Abstract : The detection and characterization of damage in automotive components made of composite materials remains a major concern that automotive manufacturers are seeking to address. The aim of this thesis project is to qualitatively and quantitatively analyze the damage induced by different solicitations in a polyamide 66/6 based composite reinforced with 2/2 woven glass fibers intended for automotive applications. For this purpose, low-velocity impact tests at different energy levels, tensile-tensile fatigue tests as well as impact post-fatigue tests are conducted. An experimental methodology relying on the use of non-destructive testing methods (NDT) is established and aims at the assessment of the damage induced by different types of loads. Several tools are used in this study, namely: optical microscopy, X-ray tomography, guided waves (Lamb waves), C-Scan imaging and other ultrasonic tools. The damage mechanisms associated with the multiple loading are observed and their degrees of propagation as a function of the type and level of loading are examined. The stiffness matrix components are estimated by means of the velocity of propagation of the bulk waves. Furthermore, a Lamb waves-based investigation is conducted. By estimating the velocity of propagation of the waves, velocity profiles as a function of the angle of emission/reception are obtained. As a result of this study, several damage indicators are proposed to quantify the damage state induced in each inspected specimen. A good correlation between all experimental results is found indicating the efficiency of the developed Lamb waves-based method. Finally, quasi-static tensile tests are carried out to estimate the post-loading residual properties.
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Submitted on : Friday, June 3, 2022 - 3:11:12 PM
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  • HAL Id : tel-03687723, version 1

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Nada Miqoi. Détection et quantification operando de l'endommagement dans les composants automobiles en composite polyamide/renfort continu soumis à la fatigue-pré et/ou post impact par les techniques ultrasonores avancées. Mécanique des matériaux [physics.class-ph]. HESAM Université, 2021. Français. ⟨NNT : 2021HESAE071⟩. ⟨tel-03687723⟩

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