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  • 1
    facet.materialart.
    Unknown
    Fatigue crack propagation in carburized X-2M steel (1985)
    Springer
    Details
    Publication Date: 1985-07-01
    Print ISSN: 1073-5623
    Electronic ISSN: 1543-1940
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 2
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    Fatigue crack propagation in carburized high alloy bearing steels (1985)
    Springer
    Details
    Publication Date: 1985-07-01
    Print ISSN: 1073-5623
    Electronic ISSN: 1543-1940
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 3
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    Effects of materials - Metallurgy viewpoint (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-20
    Description: Alloy compositions and metal working processes for roller bearing technology
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA, WASHINGTON INTERDISCIPLINARY APPROACH TO THE LUBRICATION OF CONCENTRATED CONTACTS 1970; P 409-437
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Status of Understanding for Bearing Materials (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-11
    Description: The structural materials and potential failure modes for high technology aircraft gas turbine bearings are reviewed. Among the failure modes discussed for iron-base through-hardened bearing materials are fatigue, surface distress, and corrosion. It is shown that the sub-surface initiated rolling-contact fatigue failure mode is reasonably well understood and in most cases can be controlled by proper material selection and design. Current bearing materials provide long life and high reliability in existing applications. A new generation of materials are being developed which will provide improved fracture toughness, better corrosion resistance, and a further extension of bearing fatigue life. Bearing problems due to surface distress, caused by a variety of surface and near surface anomalies, are less well understood. This area will require the implementation of an interdisciplinary effort to improve the level of understanding of metallic surface-lubricant reactions and interactions.
    Keywords: METALLIC MATERIALS
    Type: NASA Lewis Research Center Tribology in the 80's, vol. 2; p 773-794
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Bearing fatigue investigation 3 (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The operating characteristics of large diameter rolling-element bearings in the ultra high speed regimes expected in advanced turbine engines for high performance aircraft were investigated. A high temperature lubricant, DuPont Krytox 143 AC, was evaluated at bearing speeds to 3 million DN. Compared to the results of earlier, similar tests using a MIL-L-23699 (Type II) lubricant, bearings lubricated with the high density Krytox fluid showed significantly higher power requirements. Additionally, short bearing lives were observed when this fluid was used with AISI M50 bearings in an air atmosphere. The primary mode of failure was corrosion initiated surface distress (fatigue) on the raceways. The potential of a case-carburized bearing to sustain a combination of high-tangential and hertzian stresses without experiencing race fracture was also investigated. Limited full scale bearing tests of a 120 mm bore ball bearing at a speed of 25,000 rpm (3 million DN) indicated that a carburized material could sustain spalling fatigue without subsequent propagation to fracture. Planned life tests of the carburized material had to be aborted, however, because of apparent processing-induced material defects.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-168029 , NAS 1.26:168029 , GE-R82AEB304
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    The development and production of thermo-mechanically forged tool steel spur gears (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A development program to establish the feasibility and applicability of high energy rate forging procedures to tool steel spur gears was performed. Included in the study were relatively standard forging procedures as well as a thermo-mechanical process termed ausforming. The subject gear configuration utilized was essentially a standard spur gear having 28 teeth, a pitch diameter of 3.5 inches and a diametral pitch of 8. Initially it had been planned to use a high contact ratio gear design, however, a comprehensive evaluation indicated that severe forging problems would be encountered as a result of the extremely small teeth required by this type of design. The forging studies were successful in achieving gear blanks having integrally formed teeth using both standard and thermo-mechanical forging procedures.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-121227 , R73AEG284
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Flexural fatigue of hollow rolling elements (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Hollow cylindrical bars were tested in the rolling-contact fatigue tester to determine the effects of material and outside diameter to inside diameter (OD/ID) ratios of 2.0, 1.6, 1.4, and 1.2 on fatigue failure mode and subsequent failure propagation. The range of applied loads with these OD/ID ratios resulted in maximum tangential tensile stresses ranging from 165 to 655 megapascals (24,000 to 95,000 psi) at the bore surface. Flexural failures of the hollow test bars occurred when this bore stress was 490 megapascals (71,000 psi) or greater with AISI 52100 hollow bars and 338 megapascals (49,000 psi) 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 previously published full scale bearing tests.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TN-D-8313 , E-8621
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Bearing torque and fatigue life studies with several lubricants for use in the range 500 deg F to 700 deg F (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Rolling contact bearing torque measurements and fatigue life tests of high temperature lubricants
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-TN-D-3948
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
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    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
  • 10
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    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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