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Assessment of Composite Delamination Self-Healing Under Cyclic LoadingRecently, the promise of self-healing materials for enhanced autonomous durability has been introduced using a micro-encapsulation technique where a polymer based healing agent is encapsulated in thin walled spheres and embedded into a base polymer along with a catalyst phase. For this study, composite skin-stiffener flange debonding specimens were manufactured from composite prepreg containing interleaf layers with a polymer based healing agent encapsulated in thin-walled spheres. Constant amplitude fatigue tests in three-point bending showed the effect of self-healing on the fatigue response of the skin-stiffener flange coupons. After the cycling that created debonding, fatigue tests were held at the mean load for 24 hours. For roughly half the specimens tested, when the cyclic loading was resumed a decrease in compliance (increase in stiffness) was observed, indicating that some healing had occurred. However, with continued cycling, the specimen compliance eventually increased to the original level before the hold, indicating that the damage had returned to its original state. As was noted in a prevoius study conducted with specimens tested under monotonically increasing loads to failure, healing achieved via the micro-encapsulation technique may be limited to the volume of healing agent available relative to the crack volume.
Document ID
20090028603
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
O'Brien, T. Kevin (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
July 27, 2009
Subject Category
Composite Materials
Report/Patent Number
LF99-8692
Meeting Information
Meeting: ICCM-17 17th International Conference on Composite Materials
Location: Edinburgh
Country: United Kingdom
Start Date: July 27, 2009
End Date: July 31, 2009
Funding Number(s)
WBS: WBS 698259.02.07.07.03.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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