Document Type

Conference Proceeding


Review of Progress in Quantitative Nondestructive Evaluation

Publication Date



Chicago, IL


Honeycomb composites are finding ever increasing use on aircraft structures, making nondestructive detection of defects contained within honeycomb structures all the more important. This paper focuses on a new detection technique which makes use of the mechanical hysteresis seen as loops in the force‐displacement curves. It was observed from load test data that internal damage in honeycomb sandwiches causes the average slope of the force‐displacement curves to decrease and the area contained within the hysteresis loop to increase. To satisfy the inspection speed and one‐sided access requirements of NDE techniques, a dynamic loading approach was pursued where an accelerometer was used to tap the surface of the test sample. Much of the research focused on the deduction of the force‐displacement curves from an acceleration curve. This greatly increased the speed of the technique as well as reduced it to a one‐sided test, where only access to the outer surface of the structure is needed.


Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

This article appeared in AIP Conference Proceedings, 1096 (2009): 1041–1048 and may be found at:

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American Institute of Physics




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