Journal of the Serbian Chemical Society | |
Non-linear elastic behavior of carbon fibres of different structural and mechanical characteristic | |
Stevanović Momčilo M.1  Sekulić Daniela R.1  Đorđević Isidor M.1  | |
[1] Institut za nuklearne nauke 'Vinča', Beograd; | |
关键词: carbon fibres; carbon/epoxy composites; non-linear elasticity; crystallite preferential orientation; | |
DOI : 10.2298/JSC0705513D | |
来源: DOAJ |
【 摘 要 】
Five types of polyacrylonitrile, PAN, based carbon fibres, differing in modulus, breaking strain and in crystallite orientation, have been studied. Non-Hookean behavior 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 expressions 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 established 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.
【 授权许可】
Unknown