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Combining Passive Thermography and Acoustic Emission for Large Area Fatigue Damage Growth Assessment of a Composite StructurePassive thermography and acoustic emission data were obtained for improved real time damage detection during fatigue loading. A strong positive correlation was demonstrated between acoustic energy event location and thermal heating, especially if the structure under load was nearing ultimate failure. An image processing routine was developed to map the acoustic emission data onto the thermal imagery. This required removing optical barrel distortion and angular rotation from the thermal data. The acoustic emission data were then mapped onto thermal data, revealing the cluster of acoustic emission event locations around the thermal signatures of interest. By combining both techniques, progression of damage growth is confirmed and areas of failure are identified. This technology provides improved real time inspections of advanced composite structures during fatigue testing.Keywords: Thermal nondestructive evaluation, fatigue damage detection, aerospace composite inspection, acoustic emission, passive thermography
Document ID
20160009062
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Zalameda, Joseph N. (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)
Burke, Eric R. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
July 15, 2016
Publication Date
April 17, 2016
Subject Category
Composite Materials
Instrumentation And Photography
Report/Patent Number
NF1676L-22470
Meeting Information
Meeting: 2016 SPIE Defense and Commercial Sensing Conference
Location: Baltimore, MD
Country: United States
Start Date: April 17, 2016
End Date: April 21, 2016
Sponsors: International Society for Optical Engineering
Funding Number(s)
WBS: WBS 826611.04.07.02
Distribution Limits
Public
Copyright
Public Use Permitted.

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