Nonlinear effects of micro-cracks on acoustic surface and wedge waves
- Micro-cracks give rise to non-analytic behavior of the stress-strain relation. For the case of a homogeneous spatial distribution of aligned flat micro-cracks, the influence of this property of the stress-strain relation on harmonic generation is analyzed for Rayleigh waves and for acoustic wedge waves with the help of a simple micromechanical model adopted from the literature. For theMicro-cracks give rise to non-analytic behavior of the stress-strain relation. For the case of a homogeneous spatial distribution of aligned flat micro-cracks, the influence of this property of the stress-strain relation on harmonic generation is analyzed for Rayleigh waves and for acoustic wedge waves with the help of a simple micromechanical model adopted from the literature. For the efficiencies of harmonic generation of these guided waves, explicit expressions are derived in terms of the corresponding linear wave fields. The initial growth rates of the second harmonic, i.e., the acoustic nonlinearity parameter, has been evaluated numerically for steel as matrix material. The growth rate of the second harmonic of Rayleigh waves has also been determined for microcrack distributions with random orientation, using a model expression for the strain energy in terms of strain invariants known in a geophysical context.…
Document Type: | Article (unreviewed) |
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Zitierlink: | https://opus.hs-offenburg.de/3306 | Bibliografische Angaben |
Title (English): | Nonlinear effects of micro-cracks on acoustic surface and wedge waves |
Author: | Marek Rjelka, Pavel Dmitrievich PupyrevStaff MemberORCiDGND, Bernd Köhler, Andreas MayerStaff MemberGND |
Year of Publication: | 2018 |
Contributing Corporation: | American Institute of Physics |
First Page: | 744 |
Last Page: | 750 |
Parent Title (English): | Low temperature physics : an English translation of the journal, Fizika Nizkikh Temperatur |
Volume: | 44 |
Issue: | 7 |
ISSN: | 1063-777X |
DOI: | https://doi.org/10.1063/1.5041442 |
Language: | English | Inhaltliche Informationen |
Institutes: | Fakultät Wirtschaft (W) |
Institutes: | Bibliografie | Formale Angaben |
Open Access: | Closed Access |
Licence (German): | Urheberrechtlich geschützt |
Comment: | Original article: Fiz. Nizk. Temp. 44, 946-953 |