A novel method for measuring direct compressive properties of carbon fibres using a micro-mechanical compression tester |
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Authors: | A H Shinohara T Sato F Saito T Tomioka Y Arai |
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Affiliation: | (1) Institute for Advanced Materials Processing, Tohoku University, Katahira, Aoba-ku, 980 Sendai, Japan;(2) Advanced Materials and Technology Research Laboratories, Technical Development Bureau, Nippon Steel Corporation, Ida, Nakahara-ku, 211 Kawasaki, Japan |
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Abstract: | A novel method has been developed for measuring direct compressive properties such as strength and elasticity of a series of mesophase-pitch-based and PAN-based carbon fibres about 10 m in diameter by uniaxial and transverse compression tests using a micromechanical tester. The fibres were shaped into cylindrical specimens, with their size ratio of length to diameter kept at about 2 to 3, by separating them from a thin film made by polishing the cut faces of a strand of carbon fibres with epoxy resin as a matrix. Individual cylindrical specimens were stood up or laid down on a glass plate without any fixer for the measurements of axial and transverse compression properties of fibres, respectively. The fibres exhibited non-linear elasticity, with the compressive modulus decreasing with compressive deformation. The direct axial compressive strengths of pitch-based carbon fibres were found to be marginally lower than the indirect ones, whereas there was no significant difference between the two strength values for PAN-based fibres. The pitch-based fibres exhibited smaller average values of axial compressive strength than the PAN-based fibres. The transverse compressive strength, which decreases with an increase in elasticity of carbon fibres, exhibited a considerably lower average value than that of the axial compressive strength. Further, the axial compressive strength was found to be smaller than the direct tensile strength for the fibres. |
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