REASSESSMENT OF CRYOTRIBOLOGY THEORY

The interpretation of cryogenic temperature friction is enhanced by th e concurrent evaluation of the low-temperature mechanical properties o f sliding materials. Absolute sliding stability is greatly desired but difficult to attain in cryogenic systems. Experiments performed to in vestigate the material factors necessary for smooth motion indicate th at interfacial shear creep plays a key role in sliding stabilization. Because viscous creep is typically not observed at cryogenic temperatu res, we conclude that it is not possible to guarantee sliding stabilit y based solely on material selection criteria.