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  • MECHANICAL ENGINEERING  (13)
  • MATERIALS
  • 1975-1979  (13)
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  • 1
    facet.materialart.
    Unknown
    Evaluation of CBS 600 carburized steel as a gear material (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Gear endurance tests were conducted with one lot of consumable-electrode vacuum-melted (CVM) AISI 9310 gears and one lot of air-melt CBS 600 gears. The gears were 8 pitch with a pitch diameter of 8.89 centimeters (3.5 in.). Bench-type rolling-element fatigue tests were also conducted with one lot of CVM AISI 9310, three lots of CVM CBS 600, and one of air-melt CBS 600 material. The rolling-element bars were 0.952 centimeter (0.375 in.) in diameter. The CBS 600 material exhibited pitting fatigue lives in both rolling-element specimens and gears at least equivalent to that of CVM AISI 9310. Tooth fracture failure occurred with the CBS 600 gears after overrunning a fatigue spall, but it did not occur with the CVM AISI 9310 gears. Tooth fracture in the CBS 600 was attributed to excessive carbon content in the case, excessive case depth, and a higher than normal core hardness.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-1390 , E-9651
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Comparison of pitting fatigue life of ausforged and standard forged AISI M-50 and AISI 9310 spur gears (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Standard forged and ausforged spur gears made of vacuum-induction-melted, consumable-electrode, vacuum-arc-remelted AISI M-50 steel were tested under conditions that produced fatigue pitting. The gears were 8.89 cm (3.5 in.) in pitch diameter and had tip relief. The M-50 standard forged and ausforged test results were compared with each other. They were then compared with results for machined vacuum-arc-remelted AISI 9310 gears tested under identical conditions. Both types of M-50 gears had lives approximately five times that of the 9310 gears. The life at which 10 percent of the M-50 ausforged gears failed was slightly less than that at which the M-50 standard forged gears failed. The ausforged gears had a slightly greater tendency to fail by tooth fracture than did the standard forged gears, most likely because of the better forging and grain flow pattern of standard forged gears.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TN-D-8030 , E-8258
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    A Life Study of Ausforged, Standard Forged and Standard Machined AISI M-50 Spur Gears (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Tests were conducted at 350 K (170 F) with three groups of 8.9 cm (3.5 in.) pitch diameter spur gears made of vacuum induction melted (VIM) consumable-electrode vacuum-arc melted (VAR), AISI M-50 steel and one group of vacuum-arc remelted (VAR) AISI 9310 steel. The pitting fatigue life of the standard forged and ausforged gears was approximately five times that of the VAR AISI 9310 gears and ten times that of the bending fatigue life of the standard machined VIM-VAR AISI M-50 gears run under identical conditions. There was a slight decrease in the 10-percent life of the ausforged gears from that for the standard forged gears, but the difference is not statistically significant. The standard machined gears failed primarily by gear tooth fracture while the forged and ausforged VIM-VAR AISI M-50 and the VAR AISI 9310 gears failed primarily by surface pitting fatigue. The ausforged gears had a slightly greater tendency to fail by tooth fracture than the standard forged gears.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-71748 , E-8258
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Experimental and Analytical Load-Life Relation for AISI 9310 Steel Spur Gears (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Life tests were conducted at three different loads with three groups of 8.9 cm pitch diameter spur gears made of vacuum arc remelted VAR AISI 9310 steel. Life was found to vary inversely with load to the 4.3 and 5.1 power at the L10 sub and L50 sub life levels, respectively. The Weibull slope varied linearly with maximum Hertz contact stress, having an average value of 2.5. The test data when compared to AGMA standards showed a steeper slope for the load-life diagram.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-73590 , 1977 Intern, Gear Conf.; Sep 28, 1977 - Sep 30, 1977; Chicago
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    Study of Lubricant Jet Flow Phenomena in Spur Gears: Out of Mesh Condition (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Oil jet lubrication on the disengaging side of a gear mesh was analyzed. Results of the analysis were computerized and used to determine the oil jet impingement depth for several gear ratios and oil jet to pitch line velocity ratios. A gear test rig using high speed photography was used to experimentally determine the oil jet impingement depth on the disengaging side of mesh. Impingement depth reached a maximum at gear ratio near 1.5 where chopping by the leading gear tooth limited impingement depth. The pinion impingement depth is zero above a gear ratio of 1.172 for a jet velocity to pitch time velocity ration of 1.0 and is similar for other velocity ratios. The impingement depth for gear and pinion are equal and approximately one half the maximum at a gear ration of 7.0.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-73694 , E-9230 , 1977 Intern. Gear Conf.; Sep 28, 1977 - Sep 30, 1977; Chicago
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
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    Dynamic Capacity and Surface Fatigue Life for Spur and Helical Gears (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A mathematical model for surface fatigue life of gear, pinion, or entire meshing gear train is given. The theory is based on a previous statistical approach for rolling-element bearings. Equations are presented which give the dynamic capacity of the gear set. The dynamic capacity is the transmitted tangential load which gives a 90 percent probability of survival of the gear set for one million pinion revolutions. The analytical results are compared with test data for a set of AISI 9310 spur gears operating at a maximum Hertz stress of 1.71 billion N/sq m and 10,000 rpm. The theoretical life predictions are shown to be good when material constants obtained from rolling-element bearing tests were used in the gear life model.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-71743 , E-8273 , Joint Lubrication Conf.; Oct 21, 1975 - Oct 23, 1975; Miami, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unknown
    Comparison of predicted and measured elastohydrodynamic film thickness in a 20-millimeter-bore ball bearing (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Elastohydrodynamic film thicknesses were measured for a 20-mm bore ball bearing using the capacitance technique. The bearing was thrust loaded to 90, 445, and 778 N (20, 100, and 175 lb). The corresponding maximum contact stress on the inner race was 1.28, 2.09, and 2.45 GPa (185 000, 303,000, and 356, 000 psi). Test speeds ranged from 400 to 15,000 rpm. Measurements were taken with four different lubricants: (1) synthetic paraffinic; (2) synthetic paraffinic with additives; (3) synthetic type II aircraft oil; and (4) synthetic cycloaliphatic hydrocarbon traction fluid. The test bearing was mist lubricated. Test temperatures were 27, 65, and 121 C (80, 150, and 250 F). The measured results for the various test parameters were compared to theoretical predictions from computer programs. Also the data were plotted on dimensionless coordinates and compared to several classical isothermal theories.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-1542 , AVRADCOM-TR-79-20 , E-9992
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unknown
    Experimental and analytical load-life relation for AISI 9310 steel spur gears (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Life tests were conducted at three different loads with three groups of 8.9 cm, pitch diameter spur gears made of vacuum arc remelted AISI 9310 steel. Life was found to vary inversely with load to the 4.3 and 5.1 power at the L-10 and L-50 life levels, respectively. The Weibull slope varied linearly with maximum Hertz contact stress, having an average value of 2.5. The test data when compared to AGMA standards showed a steeper slope for the load-life diagram.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-DET-121 , Design Engineering Technical Conference; Sept. 26-30, 1977; Chicago, IL
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unknown
    Study of lubricant jet flow phenomena in spur gears - Out of mesh condition (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: An analysis was conducted for oil jet lubrication on the disengaging side of a gear mesh. Results of the analysis were computerized and used to determine the oil jet impingement depth for several gear ratios and oil jet to pitch line velocity ratios. An experimental program was conducted on the NASA gear test rig using high-speed photography to experimentally determine the oil jet impingement depth on the disengaging side of mesh. Impingement depth reaches a maximum at gear ratio near 1.5 where chopping by the leading gear tooth limits the impingement depth. The pinion impingement depth is zero above a gear ratio of 1.172 for a jet velocity to pitch time velocity ratio of 1.0 and is similar for other velocity ratios. The impingement depth for gear and pinion are equal and approximately one-half the maximum at a gear ratio of 1.0. Impingement depth on either the gear or pinion many be improved by relocation of the jet from the pitch line or by changing the jet angle. Results of the analysis were verified by experimental results using a high-speed camera and a well lighted oil jet.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-DET-104 , Design Engineering Technical Conference; Sept. 26-30, 1977; Chicago, IL
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
    facet.materialart.
    Unknown
    NASA gear research and its probable effect on rotorcraft transmission design (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The NASA Lewis Research Center devised a comprehensive gear technology research program beginning in 1969, the results of which are being integrated into the NASA civilian Helicopter Transmission System Technology Program. Attention is given to the results of this gear research and those programs which are presently being undertaken. In addition, research programs studying pitting fatigue, gear steels and processing, life prediction methods, gear design and dynamics, elastohydrodynamic lubrication, lubrication methods and gear noise are presented. Finally, the impact of advanced gear research technology on rotorcraft transmission design is discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: Meeting on Helicopter Propulsion Systems; Nov 06, 1979 - Nov 08, 1979; Williamsburg, VA
    Format: text
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    NASA TECHNICAL REPORTS
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