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  • LUNAR AND PLANETARY EXPLORATION  (4)
  • STRUCTURAL MECHANICS  (2)
  • Launch Vehicles and Launch Operations
  • 2010-2014
  • 2005-2009
  • 1980-1984  (6)
  • 1975-1979
  • 1982  (6)
Collection
Keywords
Years
  • 2010-2014
  • 2005-2009
  • 1980-1984  (6)
  • 1975-1979
Year
  • 1
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    Buckling test of a 3-meter-diameter corrugated graphite-epoxy ring-stiffened cylinder (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A three m diameter by three m long corrugated cylindrical shell with external stiffening rings was tested to failure by buckling. The corrugation geometry for the graphite epoxy composite cylinder wall was optimized to withstand a compressive load producing an ultimate load intensity of 157.6 kN/m without buckling. The test method used to produce the design load intensity was to mount the specimen as a cantilevered cylinder and apply a pure bending moment to the end. A load introduction problem with the specimen was solved by using the BOSOR 4 shell of revolution computer code to analyze the shell and attached loading fixtures. The cylinder test loading achieved was 101 percent of design ultimate, and the resulting mass per unit of shell wall area was 1.96 kg/sq m.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-2032 , L-14659 , NAS 1.60:2032
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Design detail verification tests for a lightly loaded open-corrugation graphite-epoxy cylinder (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Flat corrugated graphite-epoxy panels were tested in compression to verify selected design details of a ring-stiffened cylinder that was designed to support an axial compressive load of 157.6 kN/m without buckling. Three different sizes of subcomponent panels, with the same basic corrugation geometry, were tested: (1) 60.96-cm-long by 45.72-cm-wide panels to evaluate the local buckling strength of the shell wall design; (2) 91.44-cm-long by 45.72-cm-wide panels to evaluate a longitudinal joint and the load-introduction method; and (3) 254.0-cm-long by 91.44-cm-wide panels with four simulated-ring stiffeners to evaluate the ring-attachment method. The test results indicate that the modified shell-wall design, the longitudinal joint, the load-introduction method, and the stiffener-attachment method for the proposed cylinder have adequate strength to support the design load.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-1981 , L-14795 , NAS 1.60:1981
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An analysis of the structure of Saturn's magnetic field using charged particle absorption signatures (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new technique is derived for determining the structure of Saturn's magnetic field. This technique uses the observed positions of charged particle signatures due to the satellites and rings of Saturn to determine the parameters of an axially symmetric, spherical harmonic model of the magnetic field using the method of least squares. Absorption signatures observed along the Pioneer 11, Voyager 1, and Voyager 2 spacecraft trajectories are used to derive values for the orientation of the magnetic symmetry axis relative to Saturn's axis of rotation, the axial displacement of the center of the magnetic dipole from the center of Saturn, and the magnitude of the external field component. Comparing these results with the magnetic field model parameters deduced from analyses of magnetometer data leads to a preference for models that incorporate a northward offset of the dipole center by about 0.05 Saturn radii.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; July 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Mars' global properties - Maps and applications (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mars data sets from many sources have been put into a common digital format and global maps at constant scale have been produced. These formatted data sets form the basis of the Mars Consortium. They currently include maps of geology, volcanic units, channels, wind features, topography, gravity, Viking approach and apoapsis color, predawn temperature residuals, thermal inertia, radiometric and solar albedo, water vapor abundance, 1.4 micrometers albedo, crater abundance, Earth-based radar and photographic telescope observations, and terrestrial spectral observations. The generation of these data sets is briefly described. As an example of their use, the mapped geologic units are characterized in terms of color, predawn temperature and elevation, and unusual areas identified. The Oxia Palus region is examined as an example of combining higher resolution data with the Consortium data sets. Use of the existing data sets and submission of new ones are encouraged.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Planetary geology: Impact processes on asteroids (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The fundamental geological and geophysical properties of asteroids were studied by theoretical and simulation studies of their collisional evolution. Numerical simulations incorporating realistic physical models were developed to study the collisional evolution of hypothetical asteroid populations over the age of the solar system. Ideas and models are constrained by the observed distributions of sizes, shapes, and spin rates in the asteroid belt, by properties of Hirayama families, and by experimental studies of cratering and collisional phenomena. It is suggested that many asteroids are gravitationally-bound "rubble piles.' Those that rotate rapidly may have nonspherical quasi-equilibrium shapes, such as ellipsoids or binaries. Through comparison of models with astronomical data, physical properties of these asteroids (including bulk density) are determined, and physical processes that have operated in the solar system in primordial and subsequent epochs are studied.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-169709 , NAS 1.26:169709
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Chemical composition of HAL, an isotopically-unusual Allende inclusion (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Samples of hibonite, black rim, and portions of friable rim from an unusual Allende inclusion, named HAL, were analyzed by INAA and RNAA for 37 major, minor, and trace elements. An unusually low amount of Ce was found in HAL, although it otherwise was highly enriched in REE compared to C1 chondrites. HAL is also depleted in Sr, Ba, U, V, Ru, Os, and Ir relative to other refractory elements. It is concluded that the distribution of REE between hibonite and rims was established when hibonite and other refractory minerals were removed at slightly different temperatures from a hot, oxidizing gas in which they previously coexisted as separate grains. Possible locations for the chemical and mass dependent isotopic fractionation are considered to be in ejecta from the low temperature helium-burning zone of a supernova and in the locally oxidizing environment generated by evaporation of interstellar grains of near-chondritic chemical composition.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 46; Sept
    Format: text
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