Contrôle de santé des matériaux et structures par analyse de la coda ultrasonore

Abstract : With their long and complex propagation paths, coda waves can probe the propagation medium repeatedly and show a high sensitivity to the perturbations to the medium, i.e. variations in propagation velocity. Since such variations may indicate the modification of elastic properties and Coda Wave interferometry (CWI) can determine it precisely (relative resolution of 0.001%), CWI is considered a promising method for non destructive testing and evaluation (NDT&E). An experimental test is presented as an example of the CWI use on concrete for NDT&E purpose. For solving the experimental repeatability issue revealed in this test, a bias-control protocol is designed to reduce the experimental bias in CWI results. It is experimentally confirmed that this protocol can remarkably improve the reliability of CWI results and the experimental repeatability. Together with this bias-control protocol, the CWI is used to study the behaviors of concrete under uni-axial load in direct tension. Both elastic (acoustoealstic effect) and inelastic (Kaiser effect) behaviors are observed via CWI results. Effective value of acoustoelastic coefficient is then determined from CWI results and used for the detection of an early-stage damage that artificially induced to the concrete specimen. A defect-detection method of an initially linear medium (glass) is then developed by using the CWI. Due to the nonlinearity brought by the defects, acoustic mixing effect occurred, and the observation of such effect is the indication of damage. The use of a broadband pump wave and the CWI makes possible to 1) detect the damage globally without blind zone and 2) assess the damage level in an effective manner.
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Yuxiang Zhang. Contrôle de santé des matériaux et structures par analyse de la coda ultrasonore. Autre [cond-mat.other]. Université du Maine, 2013. Français. ⟨NNT : 2013LEMA1014⟩. ⟨tel-00971702v2⟩

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