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A method for ultrasonic fatigue testing of specimens much shorter than the testing-frequency half-wavelength of the material is described. A bimetallic unit is used in which the specimen under test can have practically any shape. A theoretical calibration of stress is given for specimens with circular profiles and it is shown that knowledge of the acoustic parameters of the material under test is not required for this calibration. The method is particularly useful for the testing of materials which are only available in short lengths, and it has the added advantage of providing large stress magnification factors.
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Green et al. (1976) studied this question.
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