Resonant Transmission of Air-Coupled Ultrasound Through Metallic Inserts in Honeycomb Sandwich Structures
- Iowa State University, Center for Nondestructive Evaluation, Ames, IA 50011 (United States)
- Iowa State University, Dept. of Aerospace Engineering, Ames, IA 50011 (United States)
Metallic inserts are embedded into composite honeycomb sandwiches as hard points for mechanical connections. Air-coupled ultrasound can be used for detecting disbonds between the insert and the facesheet. It was discovered in such inspections that a surprisingly large amplitude could be transmitted through thick metallic inserts (e.g. 0.75'' thick and 1.5'' diameter), whereas a thin plate of the same material will transmit a much weaker signal. This paper reports an experimental and analytic study of the geometrical effect of inserts on transmitted UT signals. Modal analyses of cylindrical inserts were made using the finite element code ANSYS. The transmission efficiency or air-coupled ultrasound correlated well with the longitudinal vibration mode of the cylinder.
- OSTI ID:
- 20655320
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 760; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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