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Mixed-mode cyclic debonding of adhesively bonded composite jointsA combined experimental-analytical investigation to characterize the cyclic failure mechanism of a simple composite-to-composite bonded joint is conducted. The cracked lap shear (CLS) specimens of graphite/epoxy adherend bonded with EC-3445 adhesive are tested under combined mode 1 and 2 loading. In all specimens tested, fatigue failure occurs in the form of cyclic debonding. The cyclic debond growth rates are measured. The finite element analysis is employed to compute the mode 1, mode 2, and total strain energy release rates (i.e., GI, GII, and GT). A wide range of mixed-mode loading, i.e., GI/GII ranging from 0.03 to 0.38, is obtained. The total strain energy release rate, G sub T, appeared to be the driving parameter for cyclic debonding in the tested composite bonded system.
Document ID
19860002788
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Rezaizadeh, M. A. (Missouri Univ. Rolla, MO, United States)
Mall, S. (Missouri Univ. Rolla, MO, United States)
Date Acquired
September 5, 2013
Publication Date
October 1, 1985
Subject Category
Composite Materials
Report/Patent Number
NASA-CR-177991
NAS 1.26:177991
Accession Number
86N12255
Funding Number(s)
PROJECT: RTOP 505-33-33-05
CONTRACT_GRANT: NAG1-425
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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