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  • 1
    facet.materialart.
    Unknown
    Rolling-element fatigue life of silicon nitride balls: Preliminary test results (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Hot pressed silicon nitride was evaluated as a rolling element bearing material. The five-ball fatigue tester was used to test 12.7 mm (0.500 in.) diameter balls at a maximum Hertz stress of 800,000 psi at a race temperature of 130 F. The fatigue spalls in the silicon nitride resembled those in typical bearing steels. The ten-percent fatigue life of the silicon nitride balls was approximately one-eighth to one-fifth that of typical bearing steels (52100 and M-50). The load capacity of the silicon nitride was approximately one-third that of typical bearing steels. The load capacity of the silicon nitride was significantly higher than previously tested ceramic materials for rolling element bearings.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-68174 , E-7219
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Effect of wall thickness and material on flexural fatigue of hollow rolling elements (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Hollow cylindrical bars were tested in a rolling-contact fatigue tester to determine the effects of material and outside diameter to inside diameter (OD/ID) ratios on fatigue failure mode and subsequent failure propagation. The range of applied loads with OD/ID ratios of 2.0, 1.6, 1.4, and 1.2 resulted in maximum tangential tensile stresses ranging from 165 to 655 MPa at the bore surface. Flexural failures of the hollow test bars occurred when this bore stress was 490 MPa or greater with AISI 52100 hollow bars and 338 MPa or greater with AISI M-50 hollow bars. Good correlation was obtained in relating the failures of these hollow bars with flexural failures of drilled balls from full-scale bearing test published previously.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 77-LUB-14
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Bending stresses in spherically hollow ball bearing and fatigue experiments (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Spherically hollow balls of 21.7, 50.0, and 56.5 percent mass reduction were operated in ball bearings and in a five-ball fatigue tester with differing outcomes. Available theoretical and experimental treatments of stresses in spherically hollow balls are reviewed and compared. Bending stresses are estimated for these spherically hollow balls to better understand the differences in ball bearing and fatigue test experience.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-71850 , E-8582 , Joint Lubrication Conf.; Oct 21, 1975 - Oct 23, 1975; Miami Beach, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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