繊維方向に直径変化を伴う炭素繊維の引張弾性率の推定

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The main objective of this study was to make clear the value of the tensile modulus of carbon fiber with diameter variation along longitudinal direction. For this purpose, the load-elongation curves obtained in the previous report were used, in which the tensile strength was only dealt with for single fibers with the gauge lengths ranging from 2 to 100mm. It was found that the mean of tensile modulus E_3 was different for different gauge lengths when the fiber diameter was determined as the minimum diameter d_3 among the three diameters measured at both ends and the middle of the gauge section. The main reason is in the fact that a large variation of the fiber diameter among the gauge length was only incompletely taken into account in the definition of d_3. Consequently, the equivalent diameter d_<eq> and the equivalent stress σ_<eq> and strain ε_<eq> were defined in order to give the tensile modulus E regardless of the diameter and the gauge length. Combining the two dimensional distributions of d_3 and d_<eq> for respective gauge lengths obtained by the numerical diameter data of 0.1 mm intervals in the previous report, and the distribution of E_3 as a function of d_3 together with a simple transformation equation between E and E_3 including d_3 and d_<eq> the distribution of the estimated tensile modulus E for each gauge length was calculated. It was shown that the mean values E^^- of the estimated tensile modulus E for different gauge lengths agreed very well, and the value E^^= = 195.5 GPa was obtained as the most probable value of the tensile modulus for PAN carbon fiber, by averaging the value E^^- of respective gauge lengths.
社団法人日本材料学会の論文
1999-08-15

繊維方向に直径変化を伴う炭素繊維の引張弾性率の推定

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