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Surveillance et Auscultation des Ouvrages en bois par Identification des Champs Hydrique et Mécanique : Couplage des Méthodes Acoustiques et Electromagnétiques

Abstract : This work is developed in the context of the SouBois project funded by the Nouvelle Aquitaine region. The target is to propose a methodology for coupling non-destructive testing (NDT) techniques based on the propagation of electromagnetic (Radar) and elastic (Ultrasound) waves. This makes the auscultation and monitoring of wooden structural elements more reliable for extending the timber construction’s life. As a first step, an analytical development of the mechanical ultrasonic wave propagation model in anisotropic material has been improved. Then a Finite Element Method simulation is realized to prepare a coupling with heterogeneous moisture fields or long-term behaviors. In a third step, an experimental campaign is introduced to identify the continuous of humidity (w) and mechanical (E, G, υ) in glulam beams at a structural scale using electromagnetic and ultrasonic waves. Several factors that could present sensitivities on the electromagnetic and mechanical waves propagation in wood are introduced like species, geometry, moisture content, density and direction of wave propagation relative to the grain angle. Finally, with a view to in situ assessment of structures, a numerical optimization methodology is proposed according to the ultrasonic measurement results which allows the estimation of global elasticity moduli (E, G, υ) through a linear relation with density under different moisture conditions.
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Submitted on : Friday, June 18, 2021 - 2:32:10 PM
Last modification on : Saturday, June 19, 2021 - 3:26:23 AM

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  • HAL Id : tel-03264682, version 1

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Xi Zhang. Surveillance et Auscultation des Ouvrages en bois par Identification des Champs Hydrique et Mécanique : Couplage des Méthodes Acoustiques et Electromagnétiques. Génie civil. Université de Limoges, 2021. Français. ⟨NNT : 2021LIMO0033⟩. ⟨tel-03264682⟩

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