Effect of fiber orientation in races and balls under rolling-contact fatigue conditions

Thomas L. Carter
Feb 1958

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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