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  • 1
    Electronic Resource
    Electronic Resource
    Carbon fibre structure by electrolytic etching (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 142-143 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PAN fibres, 1.5 denier were oxidised in air at 230 C for either 30 min or 2 h, and heat-treated at 1,000 C, 1,400 C or 2,500 C giving in total six fibre types. Single tows of each fibre type were mounted in epoxy resin blocks and 3-mm thick disks were cut normal to the fibre axis. The disks were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271142a0
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  • 2
    Electronic Resource
    Electronic Resource
    The strength of hybrid glass/carbon fibre composites (1981)
    Springer
    Journal of materials science 16 (1981), S. 2246-2256 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract When carbon fibre is combined with less-stiff higher-elongation glass fibre in a hybrid composite an enhancement of the failure strain of the carbon fibre reinforced phase is observed. This “hybrid effect” is only partially accounted for by internal compressive strains induced by differential thermal contraction during fabrication. The predominant factor is shown to be a relationship between the strength and effective bundle size of the carbon fibre ligaments which is a consequence of the statistical distribution of strengthreducing flaws in the carbon fibres. A lamina or ligament (bundle) of carbon fibres fails when there is a local critical accumulation of fibre fractures. A model based on this concept is used to relate the two-parameter Weibull strength distribution of the carbon fibre reinforced composite phase to that of single carbon fibres. The model suggests that the critical number of fibre fractures is of the order of 3, and experimental observations of the failure process support this hypothesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542387
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  • 3
    Electronic Resource
    Electronic Resource
    The strength of hybrid glass/carbon fibre composites (1981)
    Springer
    Journal of materials science 16 (1981), S. 2233-2245 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The tensile mechanical properties of hybrid composites fabricated from glass and carbon fibres in an epoxy matrix have been evaluated over a range of glass: carbon ratios and states of dispersion of the two phases. The failure strain of the carbon phase increased as the relative proportion of carbon fibre was decreased, and as the carbon fibre was more finely dispersed. This behaviour is commonly termed the “hybrid effect”, and failure strain enhancement of up to 50% has been measured. Only part of the effect may be attributed to internal compressive strains induced in the carbon phase by differential thermal contraction as the composite is cooled from its cure temperature. The laminae or ligaments of carbon fibre dispersed in the glass fibre phase show a multiple failure mode, and when the constitution is favourable catastrophic failure does not occur until a considerable number of ligament fractures have accumulated. Failure is thus progressive, and the material is effectively “tougher” than equivalent all-carbon fibre composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542386
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    Paper (German National Licenses)
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