Multi-Component Structural Health Assessment Using Guided Acoustic Waves

Persistent Link:
http://hdl.handle.net/10150/344230
Title:
Multi-Component Structural Health Assessment Using Guided Acoustic Waves
Author:
Amjad, Umar
Issue Date:
2014
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Embargo:
Release after 15-Dec-2016
Abstract:
In this dissertation different structural materials (aluminum and steel) with different geometrical shapes (plates, pipes and bars) are studied for damage detection with guided waves. Specific guided wave modes (also known as Lamb wave modes for plate type structures) are generated in a laminated aluminum plate for damage detection and quantification using a broad band piezoelectric transducer structured with a rigid electrode. Appropriate excitation frequencies and modes for inspection are selected from theoretical and experimental dispersion curves. Sensitivity of anti-symmetric and symmetric modes for delamination detection and quantification is investigated. Longitudinal guided waves are excited and recorded after transmission through reinforcing steel bars for monitoring its corrosion level. Instead of investigating the amplitude of the transmitted guided waves, or in other words, monitoring its attenuation, the differential time-of-flight (TOF) is recorded. A reliable guided wave mode is identified for the detection and quantification of corrosion in reinforcing steel bars. Hole type damage, and bonding/de-bonding or lamination/delamination in pipes are studied with Noncontact Electro-Magnetic Acoustic Transducers and PZT transducers. An adaptive method using phase of the recorded signals for detection and quantification of damages in pipes is established using multiple feature extraction techniques (Time-Frequency representations) and differential time-of-flight cross-correlation technique.
Type:
text; Electronic Dissertation
Keywords:
Guided waves; NDT; SHM; Signal Processing; TOF; Civil Engineering; Dispersion curves
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Civil Engineering
Degree Grantor:
University of Arizona
Advisor:
Kundu, Tribikram

Full metadata record

DC FieldValue Language
dc.language.isoen_USen
dc.titleMulti-Component Structural Health Assessment Using Guided Acoustic Wavesen_US
dc.creatorAmjad, Umaren_US
dc.contributor.authorAmjad, Umaren_US
dc.date.issued2014-
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.releaseRelease after 15-Dec-2016en_US
dc.description.abstractIn this dissertation different structural materials (aluminum and steel) with different geometrical shapes (plates, pipes and bars) are studied for damage detection with guided waves. Specific guided wave modes (also known as Lamb wave modes for plate type structures) are generated in a laminated aluminum plate for damage detection and quantification using a broad band piezoelectric transducer structured with a rigid electrode. Appropriate excitation frequencies and modes for inspection are selected from theoretical and experimental dispersion curves. Sensitivity of anti-symmetric and symmetric modes for delamination detection and quantification is investigated. Longitudinal guided waves are excited and recorded after transmission through reinforcing steel bars for monitoring its corrosion level. Instead of investigating the amplitude of the transmitted guided waves, or in other words, monitoring its attenuation, the differential time-of-flight (TOF) is recorded. A reliable guided wave mode is identified for the detection and quantification of corrosion in reinforcing steel bars. Hole type damage, and bonding/de-bonding or lamination/delamination in pipes are studied with Noncontact Electro-Magnetic Acoustic Transducers and PZT transducers. An adaptive method using phase of the recorded signals for detection and quantification of damages in pipes is established using multiple feature extraction techniques (Time-Frequency representations) and differential time-of-flight cross-correlation technique.en_US
dc.typetexten
dc.typeElectronic Dissertationen
dc.subjectGuided wavesen_US
dc.subjectNDTen_US
dc.subjectSHMen_US
dc.subjectSignal Processingen_US
dc.subjectTOFen_US
dc.subjectCivil Engineeringen_US
dc.subjectDispersion curvesen_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineCivil Engineeringen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorKundu, Tribikramen_US
dc.contributor.committeememberBicken, William S.en_US
dc.contributor.committeememberFrantziskonis, Georgeen_US
dc.contributor.committeememberZhang, LIanyangen_US
dc.contributor.committeememberKundu, Tribikramen_US
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