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dc.contributor.advisorMichaels, Jennifer E.
dc.contributor.authorWeng, Yu
dc.date.accessioned2018-05-31T18:14:13Z
dc.date.available2018-05-31T18:14:13Z
dc.date.created2018-05
dc.date.issued2018-04-03
dc.date.submittedMay 2018
dc.identifier.urihttp://hdl.handle.net/1853/59885
dc.description.abstractThe objective of this research is to present a comprehensive approach for characterizing and quantifying the scattering of angle-beam ultrasonic shear waves from a variety of scatterers in plates. The motivation behind analyzing angle-beam shear wave propagation and scattering is to obtain a better understanding of shear wave interactions with defects and improve the reliability and accuracy of inspection techniques for nondestructive evaluation. The scatterers investigated here include through-holes, part-through holes, and notches emanating from through-holes. Scattering from both through-holes and notches, aimed to mimic actual ultrasonic defects in practice, is of particular interest to the aerospace industry because crack-like defects usually grow from fastener holes, which presents a potential hazard to aircraft components if undetected. There are two main contributions of this research. One is the acquisition of a comprehensive set of wavefield data for a variety of scattering scenarios via wavefield imaging. The other is the development of a systematic methodology for ultrasonic shear wave scattering estimation using a complete set of signal processing techniques. All methodologies presented in this thesis are demonstrated to be effective and reliable for showing useful scattering information.
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technology
dc.subjectAngle-beam shear waves
dc.subjectWavefield imaging
dc.subjectUltrasonic scattering
dc.subjectUltrasonic ray tracing
dc.subjectUltrasonic signal processing
dc.subjectNondestructive evaluation
dc.titleA comprehensive approach for wavefield-based characterization of ultrasonic shear wave scattering in plates
dc.typeDissertation
dc.description.degreePh.D.
dc.contributor.departmentElectrical and Computer Engineering
thesis.degree.levelDoctoral
dc.contributor.committeeMemberLanterman, Aaron D.
dc.contributor.committeeMemberZhang, Ying
dc.contributor.committeeMemberSabra, Karim
dc.contributor.committeeMemberRuzzene, Massimo
dc.date.updated2018-05-31T18:14:14Z


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