Abstract
In recent years, knowledge of mechanical properties of industrial materials at cryogenic temperatures is essential for designing cryogenic appliances such as superconducting magnets. With this consideration, the authors tested tensile and fatigue properties of materials of cryogenic use at cryogenic temperatures.
The brief results of the work are as follows:
(1) Aluminum and 18-8 stainless steel retain considerable ductility at cryogenic temperatures.
(2) In general, tensile and yield strength of materials increases and elongation decreases with temperature decrease. But elongation of copper increases at cryogenic temperatures, as an exceptional case.
(3) In the cases of 18-8 stainless steel sheet and brass sheet, some differences in mechanical properties have been observed between longitudinal and transverse directions with respect to rolling direction.
(4) As for fatigue tests at -269°C, fatigue strength of SUS 27 is somewhat higher than that of SUS 28. Fatigue strength of SUS 27 is about 45kg/mm2 at 106 times repetition of load.
