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Nonlinear Acoustics Applied to NonDestructive Testing / Olinjär akustik applicerad på oförstörande provning

Sensitive nonlinear acoustic methods are suitable for material characterization. This thesis describes three nonlinear acoustic methods that are proven useful for detection of defects like cracks and delaminations in solids. They offer the possibility to use relatively low frequencies which is advantageous because attenuation and diffraction effects are smaller for low frequencies. Therefore large and multi-layered complete objects can be investigated in about one second. Sometimes the position of the damage is required. But it is in general difficult to limit the geometrical extent of low-frequency acoustic waves. A technique is presented that constrains the wave field to a localized trapped mode so that damage can be located.

Identiferoai:union.ndltd.org:UPSALLA1/oai:DiVA.org:bth-00374
Date January 2007
CreatorsHaller, Kristian
PublisherKarlskrona : Blekinge Institute of Technology
Source SetsDiVA Archive at Upsalla University
LanguageEnglish
Detected LanguageEnglish
TypeLicentiate thesis, comprehensive summary, info:eu-repo/semantics/masterThesis, text
Formatapplication/pdf
Rightsinfo:eu-repo/semantics/openAccess
RelationBlekinge Institute of Technology Licentiate Dissertation Series, 1650-2140 ; 7

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