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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
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    Unknown
    Common bearing material has highest fatigue life at moderate temperature (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: AISI 52100, a high carbon chromium steel, has the longest fatigue life of eight bearing materials tested. Fatigue lives of the other materials ranged from 7 to 78 percent of the fatigue life of AISI 52100 at a temperature of 340 K (150 F).
    Keywords: MATERIALS
    Type: LEW-11592
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Study of hot hardness characteristics of tool steels (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Hardness measurements of tool steel materials in electric furnace at elevated temperatures and low oxygen environment are discussed. Development of equation to predict short term hardness as function of intial room temperature hardness of steel is reported. Types of steel involved in the process are identified.
    Keywords: MATERIALS
    Type: LEW-11785
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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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
  • 5
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    Unknown
    Lubricants and Additives Affect Spur-Gear Fatigue (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Surface-fatigue tests conducted with AISI 9310 steel spur gears show surface-fatigue life of AISI 9310 steel spur gears increased as much as 400 percent by addition of small amount of phosphorus-type extreme-pressure (EP) additive in lubricant. Antiwear or EP additives either absorbed onto surface or react with surface to form protective coating or surface film. Boundary film provides barrier that prevents contact of metal surfaces and provides low shear strength, which reduces friction coefficient below base metal.
    Keywords: MATERIALS
    Type: LEW-14314 , NASA Tech Briefs (ISSN 0145-319X); 10; 5; P. 84
    Format: text
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    NASA TECHNICAL REPORTS
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