Wavelength reinforced thermo-acousto-photonic NDE of an elastomer to steel adhesive bond /
The research involves utilizing wavelength reinforcing of TAP-NDE to select and reinforce a particular wavelength of ultrasonic guided wave to interrogate a two layer specimen. This specimen is constructed of two different materials with a very large mismatch in their respective mechanical propertie...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739888031&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The research involves utilizing wavelength reinforcing of TAP-NDE to select and reinforce a particular wavelength of ultrasonic guided wave to interrogate a two layer specimen. This specimen is constructed of two different materials with a very large mismatch in their respective mechanical properties, steel and elastomer, which have been adhesively bonded together. The method for wavelength selection is to reconfigure the excitation laser beam through a binary optical element to convert a single input beam into multiple energetically and spatially similar output beams diverging at a constant beam to beam angle. These beams are then controlled to reinforce a single wavelength for each excitation event. Thus, the ultrasonic disturbance has greater total energy and a narrow bandwidth in the frequency domain. This technique has been used to interrogate the two-material system to ascertain from the free surface of the steel plate whether the sub-layer of elastomer is present or not. This work has shown that the presence of the two layer system is seen in the phase velocity measured only when both excitation and detection of the ultrasonic disturbance take place within the bounds of the elastomer layer. When either excitation or detection or both are conducted outside the bounds of the elastomer layer the phase velocity profile produced is that of the plate only, thus, the presence of the elastomer layer is not defined. |
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| Item Description: | Vita. "Major Subject: Mechanical Engineering". |
| Physical Description: | xvi, 176 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 155-159. |