Rolling Fatigue Test Results on RAO-28-74 and RAO-29-74.
Final rept. 22 May-1 Dec 74,
SOUTHWEST RESEARCH INST SAN ANTONIO TEX
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Ten SwRI rolling fatigue testers, using a 4-ball test specimen configuration, were employed to evaluate the effect of four different film thickness ratios on the rolling fatigue life of AISI 52100 CEVM steel balls. Two synthetic lubricants one MIL-L-7808 and one MIL-L-23699 were used in the program at two test temperature conditions, 150F and 300F, thereby providing four different film thickness ratios ranging from 0.0972 to 0.6489. The results show no significant difference, at the 90- confidence level, in the fatigue life for the CEVM 52100 steel balls using the two synthetic lubricants at constant test temperatures of 150F and 300F. However, when the results are compared on the basis of the film thickness ratio, it is seen that the two lubricants differ significantly in fatigue behavior at the 90 confidence level. This suggests that rolling fatigue life is dependent upon both the film thickness ratio and the lubricant type.
- Lubricants and Hydraulic Fluids