A comprehensive approach for wavefield-based characterization of ultrasonic shear wave scattering in plates

dc.contributor.advisor Michaels, Jennifer E.
dc.contributor.author Weng, Yu
dc.contributor.committeeMember Lanterman, Aaron D.
dc.contributor.committeeMember Zhang, Ying
dc.contributor.committeeMember Sabra, Karim
dc.contributor.committeeMember Ruzzene, Massimo
dc.contributor.department Electrical and Computer Engineering
dc.date.accessioned 2018-05-31T18:14:13Z
dc.date.available 2018-05-31T18:14:13Z
dc.date.created 2018-05
dc.date.issued 2018-04-03
dc.date.submitted May 2018
dc.date.updated 2018-05-31T18:14:14Z
dc.description.abstract The 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.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/59885
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Angle-beam shear waves
dc.subject Wavefield imaging
dc.subject Ultrasonic scattering
dc.subject Ultrasonic ray tracing
dc.subject Ultrasonic signal processing
dc.subject Nondestructive evaluation
dc.title A comprehensive approach for wavefield-based characterization of ultrasonic shear wave scattering in plates
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.corporatename School of Electrical and Computer Engineering
local.contributor.corporatename College of Engineering
relation.isOrgUnitOfPublication 5b7adef2-447c-4270-b9fc-846bd76f80f2
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
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