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Mode II interlaminar fracture of graphite/epoxy and graphite/PEEKThe end notched flexure (ENF) specimen is employed in an investigation of the interlaminar fracture toughness in Mode II (skew symmetric shear) loading of unidirectional graphite/epoxy and graphite/PEEK composites. Important experimental parameters such as the influence of precracking and the data reduction scheme for the Mode II toughness are discussed. Nonlinear load-deflection response is significant for the tough thermoplastic resin composite but is also present for the brittle thermoset composite. The observed nonlinearities, which are highly rate dependent, are attributed to a combination of slow stable crack growth preceding unstable crack growth and material inelastic behavior in the process zone around the crack tip.
Document ID
19860063225
Document Type
Reprint (Version printed in journal)
Authors
Carlsson, L. A. (Delaware Univ. Newark, DE, United States)
Gillespie, J. W. (Delaware Univ. Newark, DE, United States)
Trethewey, B. R. (Delaware, University Newark, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1986
Publication Information
Publication: Journal of Reinforced Plastics and Composites
Volume: 5
ISSN: 0731-6844
Subject Category
COMPOSITE MATERIALS
Funding Number(s)
CONTRACT_GRANT: NAG1-475
Distribution Limits
Public
Copyright
Other