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Cyclic debonding of adhesively bonded compositesTo analyze the fatigue behavior of a simple composite-to-composite bonded joint, a combined experimental and analytical study of the cracked-lap-shear specimen subjected to constant-amplitude cyclic loading was undertaken. Two bonded systems were studied: T300/5208 graphite/epoxy adherends bonded with adhesives EC 3445 and with FM-300. For each bonded system, two specimen geometries were tested: (1) a strap adherend of 16 plies bonded to a lap adherend of 8 plies, and (2) a strap adherend of 8 plies bonded to a lap adherend of 16 plies. In all specimens tested, the fatigue failure was in the form of cyclic debonding with some 0 deg fiber pull-off from the strap adherend. The debond always grew in the region of adhesive that had the highest mode I (peel) loading and that region was close to the adhesive-strap interface. Furthermore, the measured cyclic debond growth rates correlated well with total strain energy release rates G(T) as well as with its components G(I) (peel) and G(II) (shear) for the mixed-mode loading in the present study.
Document ID
19850045778
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mall, S.
(NASA Langley Research Center Hampton, VA; Maine, University, Orono, ME, United States)
Johnson, W. S.
(NASA Langley Research Center Hampton, VA, United States)
Everett, R. A., Jr.
(NASA Langley Research Center; U.S. Army, Structures Laboratory, Hampton VA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
Composite Materials
Accession Number
85A27929
Distribution Limits
Public
Copyright
Other

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