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http://dx.doi.org/10.7779/JKSNT.2012.32.3.241

Low Attenuation Waveguide for Structural Health Monitoring with Leaky Surface Waves  

Bezdek, M. (The Pennsylvania State University)
Joseph, K. (The Pennsylvania State University)
Tittmann, B.R. (The Pennsylvania State University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.32, no.3, 2012 , pp. 241-262 More about this Journal
Abstract
Some applications require structural health monitoring in inaccessible components. This paper presents a technique useful for Structural Health Monitoring of double wall structures, such as double wall steam pipes and double wall pressure vessels separated from an ultrasonic transducer by three layers. Detection has been demonstrated at distances in excess of one meter for a fixed transducer. The case presented here is for one of the layers, the middle layer, being a fluid. For certain transducer configurations the wave propagating in the fluid is a wave with low velocity and attenuation. The paper presents a model based on wave theory and finite element simulation; the experimental set-up and observations, and comparison between theory and experiment. The results provide a description of the technique, understanding of the phenomenon and its possible applications in Structural Health Monitoring.
Keywords
Leaky Surface Acoustic Waves SAWs; Double Wall Structures; Structural Health Monitoring; Low Attenuation Multilayer Waveguide; Liquid-Solid Interface; Matrix Methods; Finite Element Simulation;
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