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  • 1
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    Recent advances in thermal-structural analysis and design (1978)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: A continuing effort to develop a comprehensive capability for thermal-structural analysis and automated design (sizing) is reviewed. A principal role in the activity is played by the finite element program SPAR which contains both an efficient structural and thermal analysis capability. The benefit of having thermal and structural analyses in the same finite element program is illustrated by the application of SPAR to design calculations for the National Transonic Facility - a cryogenic wind tunnel under construction at Langley. Some experience with large-scale thermal structural analysis problems, particularly the space shuttle orbiter, has led to the identification of some analysis needs. Those needs include automated model generation and data output for lumped parameter thermal analysis, faster solution methods for nonlinear transient heat transfer, automated interpolation of temperature data from a thermal finite element model to a dissimilar structural finite model, and automated techniques to identify the times at which the critical combinations of transient heating and loads occur on a structure.
    Keywords: STRUCTURAL MECHANICS
    Type: Recent Advan. in Structures for Hypersonic Flight, Pt.2; p 897-941
    Format: text
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  • 2
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    Teflon, Kapton surface and bulk effects (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Two samples of 2 mil aluminized/Kapton thermal blanket and two samples of Teflon were received for evaluation. Their location on the solar maximum is given. The Kapton top layer of the thermal blanket had been exposed to the LEO atomic oxygen environment and shows the surface degradation due to atomic oxygen attack resulting in a diffuse character over most of the surface. The backside Kapton layer which was unexposed appeared to the eye to be in virgin condition. Another sample exhibited similar properties, but was, in large part, covered with Kapton adhesive tape and it was not possible to obtain usable specimens for analysis. One of the Teflon samples which was exposed shows signs of heavy degradation including attack on the Ag/Inconel backside by ultraviolet and atomic oxygen. The other Teflon sample which was unexposed was only slightly fogged on the Teflon side and the Ag/Inconel appeared untouched. These samples were subjected to several chemical and physical analyses, the results of which are discussed.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Goddard Space Flight Center Proceedings of the SMRM Degradation Study Workshop; p 287-316
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  • 3
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    Measurements of plasma energy density and conductivity from 3 to 120 kbar. (1967)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Plasma energy density, conductivity and temperature measurements at various pressures
    Keywords: PHYSICS, PLASMA
    Type: JOURNAL OF APPLIED PHYSICS
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  • 4
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    Effect of out-of-planeness of membrane quadrilateral finite elements. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Investigation of the effect of using plane quadrilateral membrane elements for modeling nonplanar structures. The effect is assessed by analyzing a simplified finite element model with the aid of the structure network analysis program. The results obtained indicate that the use of planar quadrilateral membrane elements for modeling bending problems can lead to large errors if the four points that define the quadrilateral are not in the same plane.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal; 11; May 1973
    Format: text
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  • 5
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    Plasma density measurements at 100 kilobars of pressure. (1966)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Measurement of plasma density generated by underwater explosions, noting modes of electrical discharge and shock front role
    Keywords: PHYSICS, PLASMA
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  • 6
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    Silica RSI Morphology and Properties (1973)
    In:  CASI
    Details
    Publication Date: 2014-09-09
    Description: The morphology of all silica materials studied has been noncrystalline and resistant to any phase transformations upon subsequent thermal testing representative of the shuttle environment envelope. The development of an extremely dependable reusable surface insulation material family offering the inherently superior characteristics of amorphous silica for the shuttle is described.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA. Ames Res. Center Symp. on Reusable Surface Insulation for Space Shuttle, Vol. 1; p 261-274
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  • 7
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    Limitations on the application of a ground-based spectral technique for determining rain forest leaf area index (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Photogrammetric Engineering and Remote Sensing; 46; Dec. 198
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  • 8
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    Analysis methods and preliminary design study (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The shuttle orbiter body flap was studied to define loads and temperatures and to assess various structural concepts. Laminated-structure analysis capability was required. An appraisal of the available structural analysis programs, NASTRAN and SPAR, indicates that neither had all the capabilities required. The thermal analysis program, MITAS solved the problem once a model was generated but model generation and verification was laborious and transfer of temperatures to the structural program usually required interpolation. Therefore it was decided to incorporate both capabilities in the SPAR finite element program.
    Keywords: COMPOSITE MATERIALS
    Type: Graphite/Polyimide Composites; p 303-318
    Format: text
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  • 9
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    Secondary electron emission from a charged dielectric (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Charges on the surface of fluorinated-ethylene-propylene affect its secondary electron emission coefficient. Measurements with impact energies exceeding that energy which causes peak emission have been made in regions where the local electric field produced by the surface charge is normal to the surface and in regions where it is oblique. The surface of the 6-mm wide specimen was charged to either 6 or 10 kV. Because the impinging primary beam was deflected by the charged specimen, numerical modeling was used to predict the beam's impact energy E, impact angle theta, and the impact point. The formula predicts the coefficient in the region of normal field up to 60 deg although E(0) depends upon the electric field and also on the history of the specimen. Near the edges where the field is oblique, the measured coefficient departs significantly from what the formula predicts.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Transactions on Electrical Insulation (ISSN 0018-9367); EI-20; 485-491
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  • 10
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    Manned Mars mission schedule report (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The schedules for hardware for the initial manned Mars mission are provided. The mission is determined to be a 1999 opposition mission and the vehicle hardware configuration for the mission is depicted.
    Keywords: ADMINISTRATION AND MANAGEMENT
    Type: Manned Mars Mission. Working Group Papers, V. 2, Sect. 5, App.; p 961-974
    Format: application/pdf
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