Full Record for Micrograph 618
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- Micrograph no
- 618
- Brief description
- Fracture surface of a carbon fibre composite
- Keywords
- alignment, carbon, carbon fibres , CFC, composite material , epoxy , fibre , fracture , neutral axis , polymer , polymer composite, pull-out , reinforcement , tensile
- Categories
- Composite, Fracture, Polymer, Polymer composite
- System
- CCcomposite
- Composition
- Carbon fibre, epoxy resin matrix
- Standard codes
- Reaction
- Carbon fibres are produced by oxidising polyacrylonitrile in air at 230 deg C whilst applying tension, and then carbonising the product in nitrogen at 1000 deg C
- Processing
- A crude carbon fibre composite was made by laying out 40 tows of fibre, painting them with epoxy resin, compressing them in a mould, and curing them for five hours at 100-190 degrees C
- Applications
- Carbon fibre composites are used as a structural material in the aerospace and automotive industries, as well as in certain high-performance sporting equipment. They present exceptional stiffness and can be structurally optimised for particular load-bearing applications.
- Sample preparation
- The bar has been bent to failure in a three-point bending rig.
- Technique
- Scanning electron microscopy (SEM)
- Length bar
- 600 μm
- Further information
- The neutral axis is clearly visible, up the centre of the image, with a region of ragged fibres indicating tensile failure to the left, and a smother, apparently crushed surface to the right where the beam was in compression. The holes and proud fibres in the tensile region are indicative of fibre pull-out which is a toughening mechanism in fibre composites.
- Contributor
- J A Curran
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 03/10/02
- Licence for re-use
- Attribution-NonCommercial-ShareAlike 4.0 International
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