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Extraction of Depth Profiles of Third-Order Elastic Constants in Cracked Media

  • Elastic constants of components are usually determined by tensile tests in combination with ultrasonic experiments. However, these properties may change due to e.g. mechanical treatments or service conditions during their lifetime. Knowledge of the actual material parameters is key to the determination of quantities like residual stresses present in the medium. In this work the acousticElastic constants of components are usually determined by tensile tests in combination with ultrasonic experiments. However, these properties may change due to e.g. mechanical treatments or service conditions during their lifetime. Knowledge of the actual material parameters is key to the determination of quantities like residual stresses present in the medium. In this work the acoustic nonlinearity parameter (ANP) for surface acoustic waves is examined through the derivation of an evolution equation for the amplitude of the second harmonic. Given a certain depth profile of the third-order elastic constants, the dependence of the ANP with respect to the input frequency is determined and on the basis of these results, an appropriate inversion method is developed. This method is intended for the extraction of the depth dependence of the third-order elastic constants of the material from second-harmonic generation and guided wave mixing experiments, assuming that the change in the linear Rayleigh wave velocity is small. The latter assumption is supported by a 3D-FEM model study of a medium with randomly distributed microcracks as well as theoretical works on this topic in the literature.show moreshow less

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Metadaten
Document Type:Conference Proceeding
Conference Type:Konferenzartikel
Zitierlink: https://opus.hs-offenburg.de/2666
Bibliografische Angaben
Title (English):Extraction of Depth Profiles of Third-Order Elastic Constants in Cracked Media
Conference:Annual Review of Progress in Quantitative Nondestructive Evaluation (43. : 17-22 July 2016 : Atlanta, Georgia, USA)
Author:Marek Rjelka, Bernd Köhler, Andreas MayerStaff MemberGND
Date of Publication (online):2017/02/16
Page Number:9
First Page:060001-1
Last Page:060001-9
Article Number:060001
Parent Title (German):AIP Conference Proceedings
Volume:1806
Issue:1
DOI:https://doi.org/10.1063/1.4974610
Language:English
Inhaltliche Informationen
Institutes:Fakultät Wirtschaft (W)
Institutes:Bibliografie
Formale Angaben
Open Access: Closed Access 
Licence (German):License LogoUrheberrechtlich geschützt