Title:
Generation and detection of lamb waves for the characterization of plastic deformation

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dc.contributor.advisor Jacobs, Laurence J.
dc.contributor.author Pruell, Christoph en_US
dc.contributor.committeeMember Kim, Jin-Yeon
dc.contributor.committeeMember Qu, Jianmin
dc.contributor.department Civil and Environmental Engineering en_US
dc.date.accessioned 2009-01-22T15:38:57Z
dc.date.available 2009-01-22T15:38:57Z
dc.date.issued 2007-08-24 en_US
dc.description.abstract In this thesis ultrasonic Lamb wave measurements are performed to detect material nonlinearity in aluminum sheets. When a Lamb wave propagates, higher harmonic wave fields are generated and under certain conditions the second harmonic is cumulative. When these conditions hold the Lamb waves are serviceable for material nonlinearity measurements. For generation, a wedge transducer combination is used. The detection of the Lamb wave are performed with either a laser interferometer or a second wedge transducer combination and the results are benchmarked. A short time Fourier transformation (STFT) is applied to the detected signal to extract the amplitudes of the first and second harmonics. A relative ratio of the first and second harmonics is deduced from nonlinear wave theory to assign the nonlinearity of the material. To verify the capability of the measurement setup and to show that cumulative second harmonics are generated, measurements for different propagation distances are performed. Further measurements on plasticly deformed specimens are carried out to examine the change of the material nonlinearity as a function of plasticity. en_US
dc.description.degree M.S. en_US
dc.identifier.uri http://hdl.handle.net/1853/26479
dc.publisher Georgia Institute of Technology en_US
dc.subject Lamb waves en_US
dc.subject Experiment en_US
dc.subject Measurements en_US
dc.subject Plastic deformation en_US
dc.subject.lcsh Lamb waves
dc.subject.lcsh Deformations (Mechanics)
dc.subject.lcsh Aluminum Plastic properties
dc.subject.lcsh Nondestructive testing
dc.title Generation and detection of lamb waves for the characterization of plastic deformation en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Jacobs, Laurence J.
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 5af40958-ece2-4a76-b071-5ba4c6d99d80
relation.isOrgUnitOfPublication 88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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