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Nonlinear acoustic nondestructive testing for aeronautical applications

Abstract : This PhD thesis work contributes to the development of nonlinear elastic methods for non-destructive testing and imaging of contact-type defects in solids.In this work, two modifications of recent nonlinear nondestructive testing methods are suggested: the coda wave interferometry combined with the nonlinear time reversal principle and air-coupled nonlinear ultrasonic imaging. The principal advantage of former technique is in its extremely high sensitivity owing to the fact that weak changes in sample's parameters are accumulated and finally greatly amplified during the formation of the coda wave. The other technique has a complimentary strength and offers a possibility of a remote detection. The developed techniques are tested on samples with artificially fabricated defects at known locations. The performance of each method is accessed and the potential for obtaining robust nonlinear images is demonstrated.The second part of the work is concerned with a theoretical description of contact acoustical nonlinearity and its use for creating of a numerical toolbox capable of simulating wave propagation in complex structures containing internal contacts. A physical model describing the tangential shift of two contacting bodies in the presence of friction has been proposed. Its result is an analytical computer-assisted solution for hysteretic relationships between normal and tangential contact displacements and loads. The contact model and derived load-displacement relationships are used as boundary conditions posed at the internal boundaries (contact surfaces) in a finite element wave propagation model programmed via commercial software
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Submitted on : Wednesday, December 12, 2018 - 2:03:05 PM
Last modification on : Friday, July 17, 2020 - 2:54:00 PM
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  • HAL Id : tel-01952810, version 1

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Andrey Trifonov. Nonlinear acoustic nondestructive testing for aeronautical applications. Micro and nanotechnologies/Microelectronics. Ecole Centrale de Lille, 2017. English. ⟨NNT : 2017ECLI0006⟩. ⟨tel-01952810⟩

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