NTRS - NASA Technical Reports Server

Back to Results
Experimental and theoretical study of Rayleigh-Lamb wave propagationMany space structures, such as the Space Station Freedom, contain critical thin-walled components. The structural integrity of thin-walled plates and shells can be monitored effectively using acoustic emission and ultrasonic testing in the Rayleigh-Lamb wave frequency range. A new PVDF piezoelectric sensor has been developed that is well suited to remote, inservice nondestructive evaluation of space structures. In the present study the new sensor was used to investigate Rayleigh-Lamb wave propagation in a plate. The experimental apparatus consisted of a glass plate (2.3 m x 25.4 mm x 5.6 mm) with PVDF sensor (3 mm diam.) mounted at various positions along its length. A steel ball impact served as a simulated acoustic emission source, producing surface waves, shear waves and longitudinal waves with dominant frequencies between 1 kHz and 200 kHz. The experimental time domain wave-forms were compared with theoretical predictions of the wave propagation in the plate. The model uses an analytical solution for the Green's function and the measured response at a single position to predict response at any other position in the plate. Close agreement was found between the experimental and theoretical results.
Document ID
Document Type
Conference Paper
Rogers, Wayne P. (Colorado Univ. Boulder, CO, United States)
Datta, Subhendu K. (Colorado Univ. Boulder, CO, United States)
Ju, T. H. (Colorado Univ. Boulder, CO, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1990
Publication Information
Publication: Second Annual Symposium
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.
Document Inquiry