NDLI: Remote imaging of local resonance for inspection of honeycomb sandwich composite panels

Content Provider	IEEE Xplore Digital Library
Author	Suji Han Jung-Ryul Lee Flynn, E.B.
Copyright Year	2015
Description	Author affiliation: LANL-CBNU Eng. Inst.-Korea, Chonbuk Nat. Univ., Jeonju, South Korea (Suji Han; Jung-Ryul Lee) \|\| Los Alamos Nat. Lab., Eng. Inst., Los Alamos, NM, USA (Flynn, E.B.)
Abstract	We have developed and tested a new ultrasonic technique for rapid, remote inspection of honeycomb and similar sandwich composites based on imaging of local resonance behavior. A single pristine honeycomb cell can be approximately modeled as a hexagonal plate with appropriate boundary conditions on its six sides. With this in mind, we excite the entire honeycomb panel continuously with a single, steady tone at the resonance frequency of the single pristine cell using a fixed-position transducer. We then measure and visualize the full-field amplitude and phase response over the inspection area using a scanning laser Doppler vibrometer. We applied the technique to two imperfect aluminum honeycomb panels. By imaging the magnitude of the response at each pixel, we found that one can simultaneously visualize the high-amplitude response of the pristine cells, the lower-amplitude response of the out-of-spec cells, the near-zero response near the cell boundaries, and the non-zero response in the damaged cell walls.
Sponsorship	IEEE
Starting Page	1
Ending Page	4
File Size	2038392
Page Count	4
File Format	PDF
e-ISBN	9781479982035
DOI	10.1109/ICSENS.2015.7370109
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-11-01
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inspection Resonant frequency Imaging Geometry Ultrasonic imaging Ultrasonic variables measurement Honeycomb structures Laser Ultrasound Nondestructive Inspection
Content Type	Text
Resource Type	Article

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