Mechanical Property of Micro Spring-like Ceramic-fibers

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A method of measuring tensile strength of a filament with a diameter of Jim order has been devised. The method allows us to measure the tensile load in the range of 20 to 1500mg with an accuracy of about 1 mg under optical-microscope observation. In order to measure the tensile strength, the cross sectional area of the specimen is estimated from a SEM micrograph of the fractured surface taken parallel to the specimen axis. Srtain is calculated by comparing the distance of markers, -i. e. 'tiny whiskers distributed on a specimen, on micrographs taken at each stage of loading. The Young's modulus and the tensile strength of a pitch-based isotropic carbon filament thus obtained were about 60GPa and 85OMPa, respectively.