Abstract
Hereunder is given a report of a new apparatus developed for measurement of fatigue in liquid medium. It is based on Torsion Rheometer (Toyo Seiki Seisakusho Ltd.), and the torsional vibration with constant angular amplitude in liquid medium is made possible.Using a round plastic bar specimen, its change in stiffness during the fatigue was carefully followed continuously by measuring the torsional moment with wire strain gauges. In addition to the torsional fatigue in liquid medium with this apparatus it is possible to evaluate durability by measuring the change of the specimen in stiffness degraded separately.As the results of the experiments it is known that this apparatus is applicable to evaluation of durability in torsional fatigue in liquid medium, but in case there is no remarkable change in stiffness we must keep down the drifting of electronic device as small as possible.This apparatus is applicable to torsional fatigue testing in the atmosphere, water, oil, and chemical reagents at various degrees of temperature.
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