Non-linear elastic behaviour of carbon fibres of different structural and mechanical characteristic
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Five types of polyacrylonitrile, PAN, based carbon fibres, differing in modulus, breaking strain and in crystallite orientation, have been studied. Non-Hookean behaviour was investigated by computing the tangent tensile and compression moduli as a function of strain, from the axial stress-strain response obtained in standard tensile, compression, as well as in modified flexural tests of unidirectional carbon/epoxy composites. The dependences of the tensile modulus on tensile strain of the carbon fibres were extracted from data obtained in single-filament tensile tests. Analytical expresssions for the tensile modulus-tensile strain and compression modulus-compression strain dependences in the performed test were deduced. The structural characterization of the carbon fibres was performed by X-ray diffraction on bundle of parallel fibres. The interlayer spacing d(002) and the apparent lateral dimension of the crystallites L-c were deduced by processing the 002 diffraction profiles. The es...tablished modulus-strain dependences were correlated with the fibre characteristics (breaking strain and mean modulus values), as well as with the characteristic of the 002 difraction profile and the d(002) and L-c values.
Кључне речи:carbon fibres / carbon/epoxy composites / non-linear elasticity / crystallite preferential orientation
Извор:Journal of the Serbian Chemical Society, 2007, 72, 5, 513-521
ISSN: 0352-5139 (print)