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  • 1
    facet.materialart.
    Unknown
    Fatigue criterion to system design, life and reliability (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A generalized methodology to structural life prediction, design, and reliability based upon a fatigue criterion is advanced. The life prediction methodology is based in part on work of Weibull and Lundberg and Palmgren. The approach incorporates the computed life of elemental stress volumes of a complex machine element to predict system life. The results of coupon fatigue testing can be incorporated into the analysis allowing for life prediction and component or structural renewal rates with reasonable statistical certainty.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 85-1140
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Effect of five lubricants on life of AISI 9310 spur gears (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Spur-gear surface fatigue tests were conducted with five lubricants using a single lot of consumable-electrode vacuum melted (CVM) AISI 9310 spur gears. The lot of gears was divided into five groups, each of which was tested with a different lubricant. The test lubricants are classified as either a synthetic hydrocarbon, mineral oil, or ester-based lubricant. All five lubricants have imilar viscosity and pressure-viscosity coefficients. A pentaerythritol base stock without sufficient antiwear additives produced a surface fatigue life pproximately 22 percent that of the same base stock with chlorine and phosphorus type additives. The presence of sulfur type antiwear additives in the lubricant did not appear to affect the surface fatigue life of the gears tested. No statistical difference in the 10-percent surface fatigue life was produced with four of the five lubricants.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TP-2419 , E-2183 , NAS 1.60:2419
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    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
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