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  • Other Sources  (13)
  • NASA Technical Reports  (13)
  • 1970-1974  (13)
  • 1960-1964
  • 1925-1929
  • 1973  (13)
Collection
  • Other Sources  (13)
Source
  • NASA Technical Reports  (13)
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  • 1970-1974  (13)
  • 1960-1964
  • 1925-1929
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  • 1
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    Summary of scientific results (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The accomplishments of the Apollo 17 flight are summarized. The basic objective of the mission was to sample basin-rim highland material and adjacent mare material and to investigate the geological evolutionary relationship between these two major units. The lunar experiments which were conducted include: (1) lunar field geology, (2) surface electrical experiments, (3) lunar traverse gravimeter experiments, (4) lunar seismic profiling experiment, (5) lunar ejecta and meteorites experiment, (6) analysis of lunar atmosphere composition, and (7) heat flow experiments.
    Keywords: SPACE SCIENCES
    Type: Apollo 17 Prelim. Sci. Rept.; 7 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A study of the compatibility of science instruments with the solar electric propulsion space vehicle (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Electromagnetic interference and field-of-view constraints are identified as the areas of most concern to science on solar electric propulsion space vehicles. Several areas are indicated which more detailed data on the space vehicle environment are needed. In addition, possible means to attain or demonstrate science/space vehicle compatibility are recommended for further iteration between space vehicle design and science payload considerations. The space vehicle design developed by the solar electric propulsion system integration technology effort is used. Two payload sets for comet Encke missions (a slow flyby and a rendezvous), as well as several instruments which are not included in the two payload sets, are analyzed to determine requirements on the space vehicle imposed by the instruments in order to meet their objectives. Environmental requirements for the sets of instruments are developed and compared to both the SEPSIT design criteria and the environment as it is presently understood.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-136213 , JPL-TM-33-641
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Elastohydrodynamic film thickness formula based on X-ray measurements with a synthetic paraffinic oil (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An empirical elastohydrodynamic film thickness formula for heavily loaded contacts based upon X-ray film thickness measurements made with a synthetic paraffinic oil is presented. The deduced relation was found to adequately reflect the high load dependence exhibited by the measured minimum film thickness data at high Hertizian contact stresses, that is, above 1.04 x 10 to the ninth N/sq m (150,000 psi). Comparisons were made with the numerical results from a theoretical isothermal film thickness formula. The effects of changes in contact geometry, material, and lubricant properties on the form of the empirical model are also discussed.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7502 , E-7041
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Effect of lubricant extreme pressure additives on rolling element fatigue life (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects of surface active additives on rolling-element fatigue life were investigated with the five-ball fatigue tester at conditions where classical subsurface initiated rolling-element fatigue is the sole mode of failure. Test balls of AISI 52100, AISI M-50, and AISI 1018 were run with an acid-treated white oil containing either 2.5 percent sulfurized terpene, 1 percent didodecyl phosphite, or 5 percent chlorinated wax. In general, it was found that the influence of surface active additives was detrimental to rolling-element fatigue life. The chlorinated-wax additive significantly reduced fatigue life by a factor of 7. The base oil with the 2.5 percent sulfurized-terpene additive can reduce fatigue life by as much as 50 percent. No statistical change in fatigue life occurred with the base oil having the 1 percent didodecyl-phosphite additive. The additives used with the base oil did not change the ranking of the bearing steels where rolling-element fatigue life was of subsurface origin.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TN-D-7383 , E-7337
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Hollow rolling element bearings (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A low mass rolling element with a lightweight core and hollow center was developed for use in bearings. The core is plated so as to provide a hard surface and increase the life and reliability of the high speed ball bearings.
    Keywords: GENERAL
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Correlation of magnetic perturbation inspection data with rolling element bearing fatigue results (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A magnetic perturbation technique was used to nondestructively detect subsurface nonmetallic inclusions in the inner races of 207-size, deep groove ball bearings. The bearings were fatigue tested at 2750 rpm under a radial load of. The inner races were subsequently sectioned at fatigue spall locations and at magnetic perturbation signal locations. Analyses of the data indicated good correlation between magnetic perturbation signals and inclusion size and location. Exclusion of those bearings that had significant magnetic perturbation signals did not alter the statistical life of the bearings.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68260 , E-7549 , Joint Lubrication Conf.,; Oct 16, 1973 - Oct 18, 1973; Atlanta GA; United States
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    NASA TECHNICAL REPORTS
  • 7
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    New observations of the solar ultraviolet chromosphere. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: We present some of the results of a rocket flight which obtained a stigmatic spectrum of the sun in the region 1190 to 1320A. The experiment achieved a spectral resolution of 0.01A throughout this range, and the effective angular resolution was about 20 sec. Lines which are formed in the chromosphere and transition zone show strong fluctuations with position on the disk. The correspondence between the H Lyman-alpha profile and chromospheric details seen in the Ca K-line is demonstrated.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 182; May 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Low mass rolling element for bearings (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Low mass rolling elements for bearings having a high fatigue strength and high resistance to flexure fatigue are reported. The elements have a lightweight core with a hollow center or is made of a low density material. The core is plated to provide a hard surface.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Correlation of magnetic perturbation inspection data with rolling-element bearing fatigue results (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: ASME PAPER 73-LUB-37 , Joint Lubrication Conference; Oct 15, 1973 - Oct 18, 1973; Atlanta, GA; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Elastohydrodynamic film thickness model for heavily loaded contacts (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An empirical elastohydrodynamic (EHD) film thickness formula for predicting the minimum film thickness occurring within heavily loaded contacts (maximum Hertz stresses above 150,000 psi) was developed. The formula was based upon X-ray film thickness measurements made with synthetic paraffinic, fluorocarbon, Type II ester and polyphenyl ether fluids covering a wide range of test conditions. Comparisons were made between predictions from an isothermal EHD theory and the test data. The deduced relationship was found to adequately reflect the high-load dependence exhibited by the measured data. The effects of contact geometry, material and lubricant properties on the form of the empirical model are also discussed.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-TM-X-68267 , E-7569 , Joint Lubrication Conf.,; Oct 16, 1973 - Oct 18, 1973; Atlanta GA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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