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Nondestructive Evaluation (NDE) for Inspection of Composite Sandwich StructuresComposite honeycomb structures are widely used in aerospace applications due to their low weight and high strength advantages. Developing nondestructive evaluation (NDE) inspection methods are essential for their safe performance. Flash thermography is a commonly used technique for composite honeycomb structure inspections due to its large area and rapid inspection capability. Flash thermography is shown to be sensitive for detection of face sheet impact damage and face sheet to core disbond. Data processing techniques, using principal component analysis to improve the defect contrast, are discussed. Limitations to the thermal detection of the core are investigated. In addition to flash thermography, X-ray computed tomography is used. The aluminum honeycomb core provides excellent X-ray contrast compared to the composite face sheet. The X-ray CT technique was used to detect impact damage, core crushing, and skin to core disbonds. Additionally, the X-ray CT technique is used to validate the thermography results.
Document ID
Document Type
Technical Memorandum (TM)
Zalameda, Joseph N.
(NASA Langley Research Center Hampton, VA, United States)
Parker, F. Raymond
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
February 3, 2015
Publication Date
November 1, 2014
Subject Category
Composite Materials
Quality Assurance And Reliability
Structural Mechanics
Report/Patent Number
Funding Number(s)
WBS: WBS 724297.40.44.07
Distribution Limits
Work of the US Gov. Public Use Permitted.
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