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Rate effects on delamiantion fracture toughness of a toughened graphite/epoxyThe objective of this study was to determine the effects of loading rate on interlaminar fracture toughness of T300/F-185 graphite/epoxy composite, having an elastomer-modified epoxy resin matrix. Mode I interlaminar fracture was investigated by means of uniform width and width-tapered double cantilever beam (DCB) specimens. Hinged tabs were used to insure unrestrained rotation at the free ends. Specimens were loaded at quasi-static deflection rates of up to 8.5 mm/s corresponding to crack extension rates of up to 21 mm/s. Crack extension was monitored by means of strain gages mounted on the surface of the specimen. Continuous records were obtained of load, deflection, and crack extension for determination of the strain energy release rate. The latter was calculated by means of the area method and beam analysis method, and expressed as a power law of the crack extension velocity. Results indicate that the strain energy release rate decreases with crack velocity by over 20 percent over three decades of crack velocity.
Document ID
19870061271
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Daniel, Isaac M.
(Northwestern University Evanston, IL, United States)
Shareef, Igbal
(Bradley University Peoria, IL, United States)
Aliyu, Abdu A.
(Northwestern Univ. Evanston, IL, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Composite Materials
Accession Number
87A48545
Distribution Limits
Public
Copyright
Other

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