DAMAGE DETECTION IN SOLID STRUCTURES BY ULTRASONIC TECHNIQUES-ANALYTICAL AND EXPERIMENTAL INVESTIGATION

Persistent Link:
http://hdl.handle.net/10150/145368
Title:
DAMAGE DETECTION IN SOLID STRUCTURES BY ULTRASONIC TECHNIQUES-ANALYTICAL AND EXPERIMENTAL INVESTIGATION
Author:
SHELKE, AMIT BALASAHEB
Issue Date:
2011
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.
Abstract:
This dissertation deals with analytical and experimental investigations of a number of distinct problems related to defect detection in solid structures. All these problems have applications in structural health monitoring (SHM) and nondestructive evaluation (NDE). With this broad goal in mind the mode selective excitation and detection scheme for guided Lamb waves in isotropic and anisotropic plates has been investigated. Change in the time of flight technique is applied to the detection of inherent variations in material properties. Symmetric and anti-symmetric modes are resolved with orthogonal phase difference and homodyning. Noncontact Electro-Magnetic Acoustic Transducers (EMATs) are developed for generation and detection of Lamb waves. Its interaction with circular defects having dimensions comparable to the wavelength is investigated. Short time Fourier Transform and Hilbert Transform are applied for feature detection and identification of localization of damages. Distributed point source method (DPSM) is applied to model the scattering of acoustical wave field and to study the stress singularity in penny shaped cracks. Both experimental and numerical investigations are performed in the framework of structural health monitoring and non destructive evaluation for gaining insight in damage initiation and progression in materials.
Type:
Electronic Dissertation; text
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.isoenen_US
dc.titleDAMAGE DETECTION IN SOLID STRUCTURES BY ULTRASONIC TECHNIQUES-ANALYTICAL AND EXPERIMENTAL INVESTIGATIONen_US
dc.creatorSHELKE, AMIT BALASAHEBen_US
dc.contributor.authorSHELKE, AMIT BALASAHEBen_US
dc.date.issued2011-
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.abstractThis dissertation deals with analytical and experimental investigations of a number of distinct problems related to defect detection in solid structures. All these problems have applications in structural health monitoring (SHM) and nondestructive evaluation (NDE). With this broad goal in mind the mode selective excitation and detection scheme for guided Lamb waves in isotropic and anisotropic plates has been investigated. Change in the time of flight technique is applied to the detection of inherent variations in material properties. Symmetric and anti-symmetric modes are resolved with orthogonal phase difference and homodyning. Noncontact Electro-Magnetic Acoustic Transducers (EMATs) are developed for generation and detection of Lamb waves. Its interaction with circular defects having dimensions comparable to the wavelength is investigated. Short time Fourier Transform and Hilbert Transform are applied for feature detection and identification of localization of damages. Distributed point source method (DPSM) is applied to model the scattering of acoustical wave field and to study the stress singularity in penny shaped cracks. Both experimental and numerical investigations are performed in the framework of structural health monitoring and non destructive evaluation for gaining insight in damage initiation and progression in materials.en_US
dc.typeElectronic Dissertationen_US
dc.typetexten_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.committeememberDeymier, Pierreen_US
dc.contributor.committeememberFrantziskonis, Georgeen_US
dc.contributor.committeememberKemeny, Johnen_US
dc.identifier.proquest11429-
dc.identifier.oclc752261303-
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