Apparatus for low-temperature fatigue tests in high vacuum
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The construction of an apparatus for low-temperature fatigue tests in vacuum is described. The electromagnetic system used for generating dynamic loads makes it possible to test flat specimens in alternating symmetrical bending at a 50 cps frequency. A vacuum of the order of 5 · 10−9 mm Hg can be produced by the evacuating system which includes a hydrogen condensation pump. The specimens are cooled with liquid nitrogen. Some tentative data on the influence of vacuum and low temperatures on the fatigue strength of stainless steel are reported.
KeywordsHydrogen Nitrogen Fatigue Stainless Steel Liquid Nitrogen
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