Clamping methods for evaluating tensile properties of carbon fibers in a form of strand were studied. When clamped with the three-plates aluminum tab and loaded through pins, the strand specimens in which the carbon fiber was impregnated with resin so as to penetrate fully among filaments exhibited the highest tensile forces. In this case, the strand specimens often broke into several pieces. With the clamping method using abrasive cloth, the strand specimens exhibited 95% of them, but their preparations were less time- consuming.
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