Interfacial shear stress distribution in model composites. II - Fragmentation studies on carbon fibre/epoxy systems

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Journal of Composite Materials; (United States)

DOI:https://doi.org/10.1177/002199839202600407· OSTI ID:5264122

Melanitis, N; Galiotis, C; Tetlow, P L; Davies, C K.L. ^[1]

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1. Queen Mary and Westfield College, London, England (United States)

Attention is given to the micromechanics of reinforcement of a model composite system consisting of a continuous high-modulus carbon fiber embedded in an epoxy resin. The composite was subjected to incremental tensile loading up to full fiber fragmentation, while the strain in the fiber was monitored at each level of load using a laser Raman spectroscopic technique. The average strain in the fiber increased linearly with applied matrix strain up to a value of 0.8 percent, when the first fiber fracture occurred. After fracture, the strain in the fiber was found to build from the tips of the fiber breaks, reaching a maximum value in the middle of each fragment. The shape of the load transfer profiles at the locality of the fiber tips indicated that the stress transfer efficiency had been affected by the fracture process. The length of interfacial debonding at the point of fiber fracture was found to be driven by the strain energy of the fractured fragments. The interfacial shear stress distributions at various levels of the applied load along individual fragments are derived from the load transfer profiles. 51 refs.

• OSTI ID: 5264122
• Journal Information: Journal of Composite Materials; (United States), Journal Name: Journal of Composite Materials; (United States) Vol. 26:no. 4; ISSN JCOMB; ISSN 0021-9983
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CARBON FIBERS
COMPOSITE MATERIALS
EPOXIDES
FIBERS
FRACTURE MECHANICS
FRAGMENTATION
INTERFACES
LASER SPECTROSCOPY
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
RAMAN SPECTRA
SHEAR PROPERTIES
SPECTRA
SPECTROSCOPY
STRAINS