繊維方向に直径変化を伴う炭素繊維の引張強度分布の推定

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Tensile strength of monofilament carbon fibers was investigated for differtent gauge lengths ranging from 2 to100 mm. In the tensile tests, the fiber diameter was determined as the minimum diameter d_3 at both ends and the center of gauge section by using an optical microscope. Weibull analysis of the data and the effective volume model for tensile strength of carbon fiber showed that the shape parameter α was not constant for different gauge lengths and the effective volume model could not be applied effectively to the results. It was found that these were caused by the fact that the diameter was never constant along a carbon fiber. Consequently, in this study, it was aimed to derive the distribution of tensile strength σ_0 based on the true minimum diameter d_0 along the gauge length. In order to do this, two dimensional distribution of d_3 and d_0 was derived from the data of diameter measured at every 0.1mm along a single fiber of 100mm assuming the normal distribution. Combining this distribution of d_3 and d_0 with the distribution of tensile strengthσ_3 based on the diameter d_3, the distribution of strength σ_0 was derived analytically, and calculated using the numerical values of included parameters. The distribution of σ_0 obtained for the respective gauge lengths mutually agreed very well and could be represented by a single normal distribution, showing the validity of the present analysis.
社団法人日本材料学会の論文
1998-07-15

繊維方向に直径変化を伴う炭素繊維の引張強度分布の推定

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