Abstract
The available literature on the subject of ultrasonic fatigue from early developments to the end of 1978 is reviewed with emphasis placed on those topics most commonly studied. These include equipment development, frequency effects on fatigue, ultrasonic-fatigue test results with and without aggressive environments present, and damping-fatigue observations. It is emphasized that ultrasonic fatigue is most useful in a practical sense when the material being tested is eventually exposed in service to frequencies near the test frequency. In some cases the advantage of very short testing is achieved by the use of high frequencies including threshold fatigue crack growth studies. Standardization of test techniques and methods are required to make ultrasonic-fatigue testing more universally accepted.
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