A cumulative damage model is applied to the failure of ball bearings under both a high-stress and a.

A cumulative damage model is applied to the failure of ball
bearings under both a high-stress and a normal (specification) radial load. At
the high load, a failure was observed at 45.3 hours. A second bearing had been
tested at the normal load level for 67 hours and at a high load level for 40
hours when it failed. Predict the failure of the bearing under normal operating
conditions.