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Detecting Lamb waves with broadband acousto-ultrasonic signals in composite structuresLamb waves can be produced and detected in ceramic matrix composites (CMC) and metal matrix composites (MMC) plates using the acousto-ultrasonic configuration employing broadband transducers. Experimental dispersion curves of lowest symmetric and lowest antisymmetric modes behave in a manner analogous to the graphite/polymer theoretical curves. In this study a basis has been established for analyzing Lamb wave velocities for characterizing composite plates. Lamb wave disperison curves and group velocities were correlated with variations in axial stiffness and shear stiffness in MMC and CMC. For CMCs, interfacial shear strength was also correlated with the first antisymmetric Lamb mode.
Document ID
19930037901
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kautz, Harold E. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Research in Nondestructive Evaluation
Volume: 4
Issue: 3
ISSN: 0934-9847
Subject Category
QUALITY ASSURANCE AND RELIABILITY
Distribution Limits
Public
Copyright
Other