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Contribution au suivi par émission acoustique de l'endommagement des structures multi-matériaux à base de bois

Abstract : The application of wood-concrete-composite hybrid materials in a mechanical structure is increasing day after day. These multi-material structures are both original and mechanically promising. Nevertheless, their use is still recent. This results are in a certain lack of knowledge about their behavior and in particular with regard to the presence of damage which may lead to the degradation of their mechanical properties. In this context, acoustic emission (AE) may be an appropriate non destructive method for the inspection and control of these structures. In order to characterize the evolution of damage in multi-material structures, it is essential to characterize the damage of each constituent material. This work presents the first part of the project for assessment of hybrid structures. It concerns the characterization by acoustic emission of the damage of wood material. One of the difficulties associated with acoustic emission monitoring of wood is the variability and the complexities in its response, because the AE response depends on the structure of the wood specie and the loading condition. In this study, under different mechanical loading (standard tensile, compression and bending tests), damage of three wood species (Douglas fir, Silver fir and poplar) is characterized by the technique of acoustic emission. Results obtained show that the acoustic emission is efficient for the early detection of the damage of the wood material. It also allows to refine the damage scenarios and to differentiate the acoustic signatures of different mechanisms by means of unsupervised pattern recognition algorithms. Moreover, the results confirm that the acoustic response is dependent on the wood specie but also on the loading condition.
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https://tel.archives-ouvertes.fr/tel-01940972
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Submitted on : Friday, November 30, 2018 - 4:03:06 PM
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  • HAL Id : tel-01940972, version 1

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Imen Yahyaoui. Contribution au suivi par émission acoustique de l'endommagement des structures multi-matériaux à base de bois. Matériaux. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30266⟩. ⟨tel-01940972⟩

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