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  • MACHINE ELEMENTS AND PROCESSES  (8)
  • 1970-1974  (8)
  • 1973  (8)
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  • 1970-1974  (8)
Year
  • 1
    facet.materialart.
    Unknown
    Pitting fatigue characteristics of AISI M-50 and super nitralloy spur gears (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Two groups of 3.50-in. pitch-diameter spur gears, without tip relief, made from consumable-electrode vacuum-melted (CVM) AISI M-50 steel and CVM super nitralloy (5Ni-2A1) were tested under conditions which produced fatigue pitting. The M-50 gears had fatigue lives approximately 50 percent longer than the super nitralloy gears. Both groups of gears failed by classical rolling-element fatigue at the pitch circle. When the gears were overrun past initial spall formation, the spalled M-50 gear teeth failed by fatigue fracture. The M-50 material had higher wear than the super nitralloy material. Differences in fatigue life and wear were not considered statistically significant.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7261 , E-7164
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    A life study of AISI M-50 and Super Nitralloy spur gears with and without tip relief (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Tests were conducted at 170 F with groups of 3.5-in.-pitch-diameter spur gear with and without tip relief made of consumable-electrode vacuum melted (CVM) Spur Nitralloy (5Ni-2Al) and CVM AISI M-50 steel. The AISI M-50 gears without tip relief had lives approximately 50 percent longer than the Super Nitralloy gears without tip relief. However, the Super Nitralloy gears with tip relief had lives equal to the AISI M-50 gears without tip relief. The difference in lives were not statistically significant. All gears failed by classical pitting fatigue at the pitch circle. However, the AIAI M-50 gears with tip relief failed by tooth fracture. AISI M-50 gear sets without tip relief having a spalled gear tooth which were deliberately overrun after spalling had occurred, failed by tooth fracture.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68269 , E-7575 , Joint Lubrication Conf.; Oct 16, 1973 - Oct 18, 1973; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Friction losses in a lubricated thrust-loaded cageless angular-contract bearing (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The NASA spinning torque apparatus was modified to measure the spinning torque on a cageless ball thrust bearing. Friction torque was measured for thrust loads varying from 44.5 to 403 newtons (10 to 90 lb) at speeds of 1000, 2000, and 3000 rpm. Tests were conducted with di-2-ethylhexyl sebacate and a synthetic paraffinic oil. These tests were run with either oil jet lubrication or with a thin surface film of lubricant only. An analytical model which included rolling resistance was developed and extended from previous models for spinning torque and lubricant rheology. The model was extended by the inclusion of rolling resistance. The computed values were in fair agreement with the experimental results and confirmed previous hypotheses that a thin lubricant film gives minimum bearing torque and an oil jet flow of a viscous lubricant will result in considerable rolling torque in addition to the torque due to ball spin.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7356 , E-7284
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    New generalized rheological model for lubrication of a ball spinning in a nonconforming groove (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The elastohydrodynamic theory for predicting the spinning friction of a ball in a nonconforming groove was modified to incorporate a rheological model. The rheological model is based on the exponential pressure viscosity relation for low shear stresses, but at high shear rates and pressures, the relation is altered to one in which the shear stress is porportional to the normal stress. The model was fitted to experimental spinning torques for four different lubricants: a synthetic paraffinic lubricant, di-2-ethylhexyl sebacate, a super-refined naphthenic mineral oil, and a polyphenyl ether (5P4E). Good agreement between the model and experiment was found.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7280 , E-7256
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    A life study of AISI M-50 and Super Nitralloy spur gears with and without tip relief (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 73-LUB-38 , Joint Lubrication Conference; Oct 15, 1973 - Oct 18, 1973; Atlanta, GA; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unknown
    Study of ball bearing torque under elastohydrodynamic lubrication (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Spinning and rolling torques were measured in an angular-contact ball bearing with and without a cage under several lubrication regimes in a modified NASA spinning torque apparatus. Two lubricants were used, a di-2 ethylhexyl sebacate and a synthetic paraffinic oil, at shaft speeds of 1000, 2000, and 3000 rpm and bearing loads from 10 lbs to 90 lbs. An analytical model was developed from previous spinning friction models to include rolling with spinning under lubrication regimes from thin film to flooded conditions. The bearing torque values have a wide variation, under any condition of speed and load, depending on the amount of lubricant present in the bearing. The analytical model compared favorably with experimental results under several lubrication regimes.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68271 , E-7284 , Joint Lubrication Conf.; Oct 16, 1973 - Oct 18, 1973; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unknown
    Gear materials for high-production light-deputy service (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The selection of a material for high volume, low cost gears requires careful consideration of all the requirements and the processes used to manufacture the gears. The wrong choice in material selection could very well mean the difference between success and failure. A summary of the cost that might be expected for different materials and processes is presented; it can be seen that the cost can span nearly three order of magnitudes from the molded plastic gear to the machined gear with stamped and powder metal gears falling in between these extremes.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-71446 , E-7684 , Power Transmission Design Show; Oct 09, 1973 - Oct 10, 1973; Chicago, IL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unknown
    Study of ball bearing torque under elastohydrodynamic lubrication (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Spinning and rolling torques were measured in an angular-contact ball bearing with and without a cage under several lubrication regimes in a modified NASA spinning torque apparatus. Two lubricants were used - a di-2 ethylhexyl sebacate and a synthetic paraffinic oil, at shaft speeds of 1000, 2000, and 3000 rpm and bearing loads from 45 newtons (10 lb) to 403 newtons (90 lb). An analytical model was developed from previous spinning friction models to include rolling with spinning under lubrication regimes from thin film to flooded conditions. The bearing torque values have a wide variation, under any condition of speed and load, depending on the amount of lubricant present in the bearing. The analytical model compared favorably with experimental results under several lubrication regimes.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 73-LUB-39 , Joint Lubrication Conference; Oct 15, 1973 - Oct 18, 1973; Atlanta, GA; US
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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