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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
81

A study of laser generated Rayleigh and Lamb waves in graphite/epoxy composites

Park, Heeyong 12 December 1991 (has links)
The application of laser generated ultrasonics was first demonstrated in the mid-seventies and has shown good potential when applied to isotropic materials. However, its use with composite materials is still in the early stages of development. This study explores the potential for application of laser generated Rayleigh and Lamb waves in graphite/epoxy composites. Numerical results are obtained by the solution of the wave equations using assumed solutions, and enforcing the boundary conditions. Experimentally, Rayleigh and Lamb waves were generated by a Q-switched ruby laser in the ablation regime and detected by piezoelectric pinducers which permitted accurate phase velocity measurements. The Rayleigh wave velocity was measured at various directions relative to the fiber direction and results were found to agree closely with numerical predictions. The increase of surface wave velocity using thin plates could be useful for the application of delamination detection in thick composites and an increase of Rayleigh wave attenuation could indicate damages caused by impact. Also, surface waves can reflect from small surface cracks. Therefore, laser generated surface waves, particularly along the fiber direction, have high potential for application in non-destructive testing. Lamb wave experiments were conducted in aluminum plates and gave distinctive signals, but there were some difficulties in detecting the precise arrival of each Lamb wave mode for the graphite/epoxy composite plates. / Graduation date: 1992
82

Cure monitoring of composite materials using optical techniques

Sathiyakumar, Selvarajah. January 2006 (has links)
Thesis (M. Sc.)--Victoria University (Melbourne, Vic.), 2006. / Includes bibliographical references.
83

The effectiveness of ultrasonic instrumentation versus hand instrumentation a thesis submitted in partial fulfillment ... periodontics ... /

Schwarcz, Jack. January 1987 (has links)
Thesis (M.S.)--University of Michigan, 1987.
84

Determination of elastic constants and damage in ceramic matrix composites using ultrasonic wave speed measurements

Spurlock, Chad Matthew. Hughes, Mary Leigh, January 2006 (has links) (PDF)
Thesis(M.S.)--Auburn University, 2006. / Abstract. Includes bibliographic references.
85

Impact of low-frequency high-power ultrasound on spoilage and potentially pathogenic dairy microbes /

Cameron, Michelle. January 2007 (has links)
Dissertation (PhD)--University of Stellenbosch, 2007. / Bibliography. Also available via the Internet.
86

Use of the ultrasonic technique in measuring inclusions in Al-Si alloy melts /

Guo, Jun Feng, January 2007 (has links)
Thèse (M.Eng.) -- Université du Québec à Chicoutimi, 2007. / La p. de t. porte en outre: Mémoire présenté à l'Université du Québec à Chicoutimi comme exigence partielle de la maîtrise en ingénierie. CaQQUQ Bibliogr.: f. 101-106. Document électronique également accessible en format PDF. CaQQUQ
87

The effectiveness of ultrasonic instrumentation versus hand instrumentation a thesis submitted in partial fulfillment ... periodontics ... /

Schwarcz, Jack. January 1987 (has links)
Thesis (M.S.)--University of Michigan, 1987.
88

High temperature thickness monitoring using ultrasonic waves

Pezant, Joannes Charles. January 2008 (has links)
Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Michaels, Jennifer; Committee Member: Jacobs, Laurence; Committee Member: Michaels, Thomas. Part of the SMARTech Electronic Thesis and Dissertation Collection.
89

Characterization of cement-based multiphase materials using ultrasonic wave attenuation

Treiber, Martin Paul. January 2008 (has links)
Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Jacobs, Laurence J.; Committee Member: Kim, Jin-Yeon; Committee Member: Qu, Jianmin. Part of the SMARTech Electronic Thesis and Dissertation Collection.
90

Analytical investigation of internally resonant second harmonic lamb waves in nonlinear elastic isotropic plates

Mueller, Martin Fritz. January 2009 (has links)
Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2010. / Committee Chair: Laurence J. Jacobs; Committee Member: Jianmin Qu; Committee Member: Jin-Yeon Kim. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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