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  • 1
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    Magnetoresistance of rare earth iron garnets (1979)
    American Institute of Physics
    Details
    Publication Date: 1979-03-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Spherical artifacts on ferrograms (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: In the past, hollow spheres detected on ferrograms have been interpreted as being due to fretting, abrasion, cavitation erosion, and fatigue-related processes. Here it is reported that such spheres were found to result from the fact that a routine grinding operation on a steel plate was carried out about 20 feet away from the ferrograph. A similar grinding operation was performed on a piece of low carbon steel a few feet from the ferrograph, and after a few minutes of grinding, the resulting ferrogram contained thousands of particles of which more than 90% were spherical. Because of the widespread occurrence of ordinary grinding operations, it seems prudent that those utilizing the ferrograph be cognizant of this type of artifact.
    Keywords: MECHANICAL ENGINEERING
    Type: Wear; 37; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Characterization of wear debris generated in accelerated rolling-element fatigue tests (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A ferrographic analysis was used to determine the types and quantities of wear debris generated during accelerated rolling contact fatigue tests. The five-ball rolling contact fatigue tester was used. Ball specimens were made of a corrosion resistant, high-temperature bearing steel. The lubricant was a superrefined naphthenic mineral oil. Conditions included a maximum Hertz stress of 5.52 10 to the 9th power Pa and a shaft speed of 10,000 rpm. Four types of wear debris were observed: (1) normal rubbing wear particles, (2) fatigue microspall particles, (3) spheres, and (4) friction polymer deposits. The characterization of wear debris as a function of time was of limited use in predicting fatigue failures in these accelerated tests.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-1203 , E-9260
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Film thickness measurements on five fluid formulations by the mercury squeeze film capacitance technique (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The thinning characteristics of five fluids were studied by measuring film thickness as a function of time. The mercury squeeze film capacitance technique was used. All tests were performed at room temperature. The synthetic hydrocarbon plus a nematic liquid crystal, N-(p-methoxybenzylidene)-p-butylaniline, thinned according to a Newtonian model and retained its bulk viscosity. The synthetic hydrocarbon plus a phosphonate antiwear additive and the synthetic hydrocarbon plus n-hexadecanol produced residual thick films. The synthetic hydrocarbon base fluids and the synthetic hydrocarbon plus a paraffinic resin displayed viscosity increases during thinning, but no residual films were formed.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TN-D-8171 , E-8554
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Ferrographic analysis of wear particles from sliding elastohydrodynamic experiments (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Ferrograph was used to analyze wear debris generated in a sliding elastohydrodynamic contact. The amount of wear debris correlates well with the ratio of film thickness to composite surface roughness (A ratio). The general wear level parameter and the wear severity index yielded similar correlations with average A ratios. Essentially all the generated wear particles were of the normal rubbing wear type. The Ferrograph was more sensitive in detecting the wear debris than was the commonly used emission spectrograph.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TP-1230 , E-9300
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Effect of sterilization irradiation on friction and wear of ultrahigh-molecular-weight polyethylene (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of sterilization gamma irradiation on the friction and wear properties of ultrahigh molecular weight polyethylene (UHMWPE) sliding against 316L stainless steel in dry air at 23 C was determined. A pin-on-disk apparatus was used. Experimental conditions included a 1-kilogram load, a 0.061- to 0.27-meter-per-second sliding velocity, and a 32000- to 578000-meter sliding distance. Although sterilization doses of 2.5 and 5.0 megarads greatly altered the average molecular weight and the molecular weight distribution, the friction and wear properties of the polymer were not significantly changed.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TP-1462 , E-9697
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A study of various synthetic routes to produce a halogen-labeled traction fluid (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Several synthetic routes were studied for the synthesis of the compound 1, 1, 3-trimethyl-1, 3-dicyclohexyl-2 chloropropane. This halogen-labeled fluid would be of use in the study of high traction lubricants under elastohydrodynamic lubrication conditions using infrared emission spectroscopy. The synthetic routes included: dimerization of alpha-methylstyrene, methanol addition to alpha-methylstyrene, a Wittig reaction, and an organometallic approach. Because of steric hindrance and competing reactions, none of these routes were successful.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA-TM-79024 , E-9821
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Ferrographic analysis of wear debris generated in accelerated rolling element fatigue tests (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Ferrographic analysis was used to determine the types and quantities of wear particles generated during accelerated rolling contact fatigue tests. The NASA five-ball rolling contact fatigue tester was used. Ball specimens were made of AMS 5749, a corrosion-resistant high-temperature bearing steel. The lubricant was a super-refined naphthenic mineral oil. Conditions included a maximum Hertz stress of 5.52 billion Pa and a shaft speed of 10,000 rpm. Four types of wear particles were observed: normal rubbing wear particles, fatigue spall particles, spheres, and friction polymer.
    Keywords: MECHANICAL ENGINEERING
    Type: Joint Lubrication Conference; Oct 03, 1977 - Oct 05, 1977; Kansas City, MO; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Boundary lubrication of formulated C-ethers in air to 300 C (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Friction and wear measurements were made in dry and moist air on CVM M-50 steel lubricated with six C-ether formulations containing phosphorus ester and organic acid additives. Results were compared to those obtained with a formulated Type 2 ester and the C-ether base fluid. A ball-on-disk sliding friction apparatus was used. Experimental conditions were a 1-kilogram load, 17 meter-per-minute (100 rpm) surface speed, and a 25 to 300 C disk temperature range. The C-ether base fluid and the C-ether formulations yielded lower wear than the ester under most test conditions. The C-ether formulations exhibited higher friction coefficients than the ester from 150 to 300 C and similar or lower values from 25 to 150 C.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-71668 , Ann. Meeting of the Am. Soc. of Lubrication Engr; May 05, 1975 - May 09, 1975; Atlanta, GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Ferrographic analysis of wear debris generated in a sliding elastohydrodynamic contact (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Ferrograph has been used to analyze wear debris generated in a sliding elastohydrodynamic contact. The amount of wear debris correlates well with the ratio of film thickness to composite surface roughness (Lambda ratio). Essentially all of the generated wear particles were of the normal rubbing wear type.
    Keywords: MECHANICAL ENGINEERING
    Type: ASLE PREPRINT 77-AM-1A-1 , Annual Meeting; May 09, 1977 - May 12, 1977; Montreal; Canada
    Format: text
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    NASA TECHNICAL REPORTS
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