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Large Area Nondestructive Evaluation of a Fatigue Loaded Composite StructureLarge area nondestructive evaluation (NDE) inspections are required for fatigue testing of composite structures to track damage initiation and growth. Of particular interest is the progression of damage leading to ultimate failure to validate damage progression models. In this work, passive thermography and acoustic emission NDE were used to track damage growth up to failure of a composite three-stringer panel. Fourteen acoustic emission sensors were placed on the composite panel. The signals from the array were acquired simultaneously and allowed for acoustic emission location. In addition, real time thermal data of the composite structure were acquired during loading. Details are presented on the mapping of the acoustic emission locations directly onto the thermal imagery to confirm areas of damage growth leading to ultimate failure. This required synchronizing the acoustic emission and thermal data with the applied loading. In addition, processing of the thermal imagery which included contrast enhancement, removal of optical barrel distortion and correction of angular rotation before mapping the acoustic event locations are discussed.
Document ID
20160010007
Document Type
Conference Paper
Authors
Zalameda, Joseph N.
(NASA Langley Research Center Hampton, VA, United States)
Burke, Eric R.
(NASA Langley Research Center Hampton, VA, United States)
Horne, Michael R.
(National Inst. of Aerospace Hampton, VA, United States)
Madaras, Eric I.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 3, 2016
Publication Date
June 6, 2016
Subject Category
Structural Mechanics
Composite Materials
Report/Patent Number
Paper No. 314
NF1676L-22664
Meeting Information
Society for Experimental Mechanics International Congress(Orlando, FL)
Funding Number(s)
WBS: WBS 826611.04.07.02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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