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Vibration and Earthquake Isolation

Cyclic-fatigue-testing-apparatus

Method and apparatus for real-time structure parameter modification

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Cyclic fatigue testing apparatus

Details

Inventors: Ohya, Kanji; Ogura, Kohji;
Assignee: NGK Spark Plug Co., Ltd. (JP)
Primary Examiner: Myracle; Jerry W.
Assistant Examiner:
Attorney, Agent or Firm: Larson & Taylor

A cyclic fatigue testing apparatus intended for testing the cyclic fatigue of samples such as ceramic or the like, in which it comprises a vibration plate assembly comprising a flex plate provided with piezoelectric element layer(s) on at least one surface thereof, a sample supporting member disposed on the vibration plate for supporting the sample and a loading member for forcing the samnple onto the supporting member. The apparatus can operate over a wide frequency range by adjusting the position of the sample supporting member with respect to the flex plate and selecting the frequency of an alternating voltage to be applied to each piezoelectric element layer.

DETAILED DESCRIPTION According to one aspect of the present invention, there is provided a cyclic fatigue testing apparatus for testing the cyclic fatigue of samples such as ceramic, comprising a vibration plate assembly having a flexible plate provided with a piezoelectric element layer on at least one surface thereof, at least one end portion of said flexible plate being secured to a stationary table, a supporting member mounted on the bending surface of said vibration plate assembly for supporting the sample, and means for forcing the sample onto the supporting member.
Preferably, the flexible plate of the vibration plate assembly may be secured to the table at one end portion and may be provided with a weight at the other end portion.
Alternatively, the flexible plate of the vibration plate assembly may be secured to the table at the both end portions which have outwardly extended edges on which the weights are mounted, respectively.
Preferably, the stationary table may be provided with elastic supporting means for compensating any overload applied by the loading means to the sample.
According to another aspect of the present invention, there is provided a cyclic fatigue testing apparatus for testing the cyclic fatigue of samples such as ceramic, comprising a vibration plate assembly having a flexible plate provided with a piezoelectric element layer on at least one surface thereof, at least one end portion of said flexible plate being secured to a stationary table, a supporting member for supporting the sample, means for liftably retaining said sample supporting member, an elastic strip member for interconnecting said sample supporting member and the bending surface of said vibration plate assembly, and means for forcing the sample onto said sample supporting member.
Preferably, the elastic strip member has one end secured to the bending surface of said vibration plate assembly and the other end connected to the underside of the sample supporting member through an interconnecting rod which passes through a hole provided in the retaining means

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