Thomas L. Carter
The effect of fiber orientation on fatigue life was studied for both races and balls in the fatigue spin rig. Three cylindrical race specimens of AISI T-1 tungsten tool steel with controlled fiber orientation were tested under rolling-contact fatigue conditions with 9/16-inch SAE 52100 balls at a maximum theoretical Hertz compressive stress of 750,000 pounds per square inch. A large group of balls with subgroups of ten different materials was also tested at room temperature and a maximum Hertz compressive stress level of 725,000 pounds per square inch.
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