Question: The same 02-30 angular-contact ball bearing as in Prob. 1118 is to be subjected to a two-step loading cycle of 4 min with a loading

The same 02-30 angular-contact ball bearing as in Prob. 11–18 is to be subjected to a two-step loading cycle of 4 min with a loading of 18 kN, and one of 6 min with a loading of 30 kN. This cycle is to be repeated until failure. Estimate the total life in revolutions, hours, and loading cycles.

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