Fiber Orientation Control of Short Fiber Composites: Experiment

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Abstract
Orientation control of short fibers in a liquid matrix has been carried out by loading a magnetic field. Nickel coated graphite short fiber was used as a magnetic inductive fiber. From a practical point of view, main attention was placed upon the determination of the critical volume fraction of the fibers Vfc , which was the maximum value at which the ori entation control was possible. Vfc was experimentally shown to increase rapidly with decrease of aspect ratio of the fibers. Then, in order to force the increase of Vfc , ultrasonic vibration combined with the magnetic moment was loaded to loosen tangled fibers. The loading of the ultrasonic vibration had a remarkable effect in raising the Vfc .

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