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Caractérisation de matériaux composites sur structures à géométries complexes par problème inverse vibratoire local

Abstract : Composite materials have high stiffness for a low mass. Common methods to represent the vibratory behavior of these materials are often not appropriate, as they do not characterize the material being shaped. However, the dynamic properties of the material can vary during its manufacture and can be dependent on space. New approaches are therefore needed to better understand these phenomena.The approach proposed in this thesis uses a local inverse method, strongly inspired by the FAT (Force Analysis Technique) for the identification of material properties. This work proposes to extend the scope of this method to composite structures with complex geometry, replacing the analytical operator with a Finite Element operator. Composite materials are then considered homogeneous and their properties are sought. In the case of a complex geometry two pairs of parameters are identified, the homogenized Young's modulus of complex traction and the homogenized Young's modulus of complex bending, resulting from the coupling between the longitudinal and transverse movements. As inverse methods are known to be sensitive to measurement uncertainties, a probabilistic approach is presented to regularize measurement noise. The regularization is then automatic and does not require any parameters to be adjusted.The identification of structural parameters, which can be global or local, is presented on straight beams, curved beams, plates and shells.
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https://tel.archives-ouvertes.fr/tel-02443226
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Submitted on : Friday, January 17, 2020 - 8:31:57 AM
Last modification on : Tuesday, March 31, 2020 - 3:21:24 PM

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2019LEMA1026.pdf
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  • HAL Id : tel-02443226, version 1

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Paul Bottois. Caractérisation de matériaux composites sur structures à géométries complexes par problème inverse vibratoire local. Mécanique des matériaux [physics.class-ph]. Université du Maine, 2019. Français. ⟨NNT : 2019LEMA1026⟩. ⟨tel-02443226⟩

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