NDLI: Air-coupled ultrasonic estimation of viscoelastic stiffnesses in plates

Content Provider	IEEE Xplore Digital Library
Author	Safaeinili, A. Lobkis, O.I. Chimenti, D.E.
Copyright Year	1986
Abstract	Materials characterization by means of megahertz air-coupled ultrasound is reported in this paper. In plates of composite laminates the reconstruction of a function closely related to the transmission coefficient has been accomplished using leaky guided waves. The spatial and frequency dependence of the transmitted leaky waves have been measured for a variety of plates, including aluminum-aramid and graphite-epoxy. These results are based on a general method, developed in this paper, to reconstruct a transmission function experimentally from scans both of receiver position and incident angle. A synthetic aperture technique is utilized to reduce the measurements by forming an effective wide-angle focused aperture. This synthetic focused aperture is obtained experimentally by summing measured signals coherently for many transmitter-receiver separations and summing incoherently for many transducer angles with respect to the plate normal. These results have been employed to deduce, with high precision, a function related to the plane-wave transmission coefficient of the plate over the frequency and angular bandwidths covered by the measurements. Calculation of this function is demonstrated, and the source of its deviation from the plane-wave transmission coefficient is explained. The experimental results show good agreement when compared to three-dimensional theoretical beam calculations. The high degree of accuracy in the measured transmission function has been exploited to construct an efficient inversion algorithm to estimate the viscoelastic material properties and/or sample thickness.
Starting Page	1171
Ending Page	1180
Page Count	10
File Size	996643
File Format	PDF
ISSN	08853010
Volume Number	43
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Viscosity Elasticity Frequency measurement Ultrasonic imaging Laminates Frequency dependence Ultrasonic variables measurement Transducers Bandwidth Thickness measurement
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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