ESTIMATION OF TENSILE STRENGTH DISTRIBUTION FOR CARBON FIBER WITH DIAMETER VARIATION ALONG FIBER

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Tensile strength distribution of carbon fibers was investigated for different gauge lengths ranging from 2 to 100 mm. In tensile tests, the fiber diameter was determined as the three-point minimum diameter d_3 at neighborhoods of 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 a 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 the tensile strength σ_0 for the true minimum diameter d_0 along the gauge length. In order to do this, two-dimensional distributions of d_3 and d_0 were derived from the data of diameter measured at every 0.1mm along a single fiber with the gauge length of 100mm. Combining these distributions of d_3 and d_0 with the distribution of the tensile strength σ_3 for the diameter d_3, the distribution of the strength σ_0 was derived analytically, and calculated by using numerical values of included parameters. The distributions of σ_0 obtained for respective gauge lengths mutually agreed very well and could be represented by a single normal distribution, and this showed the validity of the present analysis.
社団法人日本材料学会の論文
1999-06-15

ESTIMATION OF TENSILE STRENGTH DISTRIBUTION FOR CARBON FIBER WITH DIAMETER VARIATION ALONG FIBER

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