Fatigue Testing at 4 K with a Helium Recondensation System
A liquid helium temperature fatigue testing system was developed at the National Research Institute for Metals, Tsukuba Laboratories. The system is equipped with a recondenser installed in the test machine cryostat. Helium mist is transferred to the recondenser from the refrigerator, and the evaporated helium gas in the cryostat is recondensed into liquid helium. Thus, the liquid helium level in the cryostat is kept constant without the addition of liquid helium during testing. Continuous operation of about 500 h has been achieved with this fatigue testing system.
KeywordsLiquid Helium National Research Institute Liquid Helium Temperature Crack Initiation Site Latent Heat Capacity
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- 1.“Handbook on Materials for Superconducting Machinery,” Sheet No. 8.1.3–4 (11/76), Metals and Ceramics Information Center, Columbus, Ohio (1977).Google Scholar
- 2.T. Ogata, K. Ishikawa, K. Nagai, K. Hiraga, Y. Nakasone, and T. Yuri, Helium cooling system for long-term fatigue test at liquid helium temperature, Tetsu-to-Hagane 71:236–241 (1985), in Japanese.Google Scholar
- 3.T. Ohtani, Y. Ohtsu, N. Shiki, Y. Tomisaka, Y. Kawate, Y. Monju, and T. Horiuchi, Performance test of new recondensing type cooling system designed for fatigue testing machine at liquid helium temperature, in: “Proceedings of the International Cryogenic Engineering Conference — 9,” Butterworths, London (1982), pp. 604–607.Google Scholar
- 4.T. Ogata, K. Ishikawa and K. Nagai, Effects of strain rate on the tensile behavior of stainless steels, copper, and an aluminum alloy at cryogenic temperatures, Tetsu-to-Hagane 71:1390–1397 (1985), in Japanese.Google Scholar