Modeling of Lamb waves and application to crack identification

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Authors
Palmos, Epameinondas
Subjects
Advisors
Kwon, Young W.
Pollak, Randall D.
Date of Issue
2009-09
Date
Publisher
Monterey, California. Naval Postgraduate School
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Abstract
The objective of this study is to model Lamb waves generation and sensing for application to crack identification in engineering structures. Three topics were analyzed numerically using multiphysics finite element analysis. Initially, different types of Lamb wave generation techniques were investigated. A comparison between modeling the sinusoidal application of horizontal force (or displacement) as input and modeling the piezoelectric response of an actuator subjected to sinusoidal voltage input was performed. Secondly, the effects of a crack (disbond) between a piezoelectric wafer and the structure were analyzed, both for the piezoelectric actuator that generates the waves and for the sensor that measures the response. Finally, the appropriate fidelity of modeling a structural crack was investigated. In particular, the use of contact elements was evaluated on their role in the accurate prediction of the wave scattering from cracks or defects inside the structure.
Type
Thesis
Description
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Organization
Naval Postgraduate School (U.S.)
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Format
xvi, 97 p. : ill. ;
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Distribution Statement
Approved for public release; distribution is unlimited.
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