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During the 1990 s several methods have been developed around the world in order to test specimens at very high fatigue life (for example SWRI, Air Force Laboratory in the US, the University of Vienna in Europe, and NRIM in Japan). In our laboratory an automatic ultrasonic fatigue testing system was designed and built 10 years ago to determine the fatigue crack growth threshold of metallic alloys. Those first results were published in ASTM STP 1231 in 1994. Since this date, many applications of this device were made facing different technological challenges.
At this time our machine is working at 20kHz, with R ratio between -1 and 0.8, at room temperature, high temperature, cryogenic temperature, atmospheric pressure, and high pressure up to 300 bar. The system was designed for special applications such as testing in a hydrogen gas, hydrogen liquid or water or salt water, and to determine SN curves up to 1010 cycles.
piezoelectric machine, gigacycle fatigue, environmental effects, cryogenic temperature, fretting fatigue
Professor, CNAM-ITMAA, Paris,
De Monicault, JM
Engineer, SNECMA, Vemon,
Engineer, ASCOMETAL, Hagondange,