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A FUNDAMENTAL STUDY OF ROLLING CONTACT FATIGUE
ALLOY ENGINEERING AND CASTING CO CHAMPAIGN ILL
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An investigation was begun on rolling contact fatigue. The initial plastic flow in single crystals when stressed by a rolling steel ball will be studied by etch pit techniques. Single crystals of LiF were etched with a 1.5 x 10 to the 4th power molar solution of FeCl3 before and after stressing. Rather indistinct pyramidal pits were observed on old dislocations, and sharp square pyramidal pits on new dislocations which indicate the first areas of plastic flow and where a fatigue crack could start. A test apparatus was designed for rolling balls on the surface of single crystals under carefully controlled conditions to obtain plastic flow at the contact. It is planned to study the influence of lubricants on rolling contact and torsion fatigue.
APPROVED FOR PUBLIC RELEASE