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Communication Dans Un Congrès Année : 2012

Validation of a thermal compensation technique for Coda Wave Interferometry (CWI) analysis of acousto-elastic effect

Yuxiang Zhang
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Odile Abraham
Alain Le Duff
Bertrand Lascoup
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Ahmed Loukili
Frédéric Grondin
Olivier Durand
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Résumé

Acousto-elastic effect is an observation of material's nonlinear elastic properties, which are sensitive to early stage damages. In a study of acousto- elasticity, stress-induced velocity variation is a key parameter for the understanding of material's mechanical behaviors and a reliable estimation of acousto-elastic coefficient. In heterogeneous material as concrete, Coda Wave Interferometry (CWI) analysis can monitor the variation of the propagation velocity with a high precision (relative resolution of $ 10^{-3}\% $), which makes it adequate for studying the acousto-elastic effect in concrete. On the other hand, as propagation velocity is also affected by temperature, the thermal-induced velocity variation causes a non-negligible bias to the CWI result of stress-induced velocity variation. In this paper we present a bias control technique for CWI analysis designed for the compensation of: 1) the thermal-induced velocity change due to environmental temperature fluctuation and 2) experimental bias resulting from entire procedures of measurement and signal processing. Its effectiveness is tested under laboratory condition by applying direct uniaxial tensile force on a concrete specimen.
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hal-00811096 , version 1 (23-04-2012)

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  • HAL Id : hal-00811096 , version 1

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Yuxiang Zhang, Odile Abraham, Vincent Tournat, Alain Le Duff, Bertrand Lascoup, et al.. Validation of a thermal compensation technique for Coda Wave Interferometry (CWI) analysis of acousto-elastic effect. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811096⟩
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