Non-linear elastic behavior of carbon fibres of different structural and mechanical characteristic

Journal of the Serbian Chemical Society

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