Plate Wave Resonance with Air-Coupled Ultrasonics

Bar, H N and Dayal, V and Barnard, D and Hsu, D K (2010) Plate Wave Resonance with Air-Coupled Ultrasonics. Review of Progress in Quantitative Nondestructive Evaluation, 29A 29B (1211). pp. 1069-1076.

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Abstract

Air-coupled ultrasonic transducers can excite plate waves in metals and composites. The coincidence effect, i.e., the wave vector of plate wave coincides with projection of exciting airborne sound vector, leads to a resonance which strongly amplifies the sound transmission through the plate. The resonance depends on the angle of incidence and the frequency. In the present study, the incidence angle for maximum transmission (theta(max)) is measured in plates of steel, aluminum, carbon fiber reinforced composites and honeycomb sandwich panels. The variations of (theta(max)) with plate thickness are compared with theoretical values in steel, aluminum and quasi-isotropic carbon fiber composites. The enhanced transmission of air-coupled ultrasound at oblique incidence can substantially improve the probability of flaw detection in plates and especially in honeycomb structures. Experimental air-coupled ultrasonic scan of subtle flaws in CFRP laminates showed definite improvement of signal-to-noise ratio with oblique incidence at theta(max).

Item Type:Article
Official URL/DOI:http://library/articleDetails.jsp?recordid=941
Uncontrolled Keywords:Steel; EIS; Polarization; XRD; Passivity
Divisions:Metal Extraction and Forming
ID Code:3017
Deposited By:Mr. G Shailendra Kumar
Deposited On:15 Jun 2011 17:39
Last Modified:13 Dec 2011 16:19
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