| 摘要 |
PURPOSE:To make a fatigue test by using a high-cycle minute load, by coupling a piston with a reaction force section by means of an auxiliary reaction jig. CONSTITUTION:When a piston 1a is driven at a high cycle, loads corresponding to the spring constants of a test piece T and auxiliary reaction jig 7 are respec tively produced to the test piece T and jig 7. In this case, the loads applied to the test piece T and auxiliary reaction jig 7 are respectively detected by the 1st and 2nd load cells 5 and 6 and, at the same time, monitored by a moni tor unit 12. Moreover, the outputs of a load amplifier 10 and function generator 13 are inputted to a subtractor 14 and a servo valve 2 is operated in accordance with a subtraction result of the subtractor 14 and, as a result, the operating speed of the piston 1a is set to a prescribed one. Therefore, the minute load of the test piece T detected by the 1st load cell 5 becomes almost equal to the load of the auxiliary reaction jig 7 detected by the 2nd load cell 6 and a fatigue test by using a high-cycle minute load can be performed.
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