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  • Chemistry  (1)
  • SPACECRAFT PROPULSION AND POWER  (1)
  • 1990-1994  (2)
  • 1935-1939
  • 1
    Electronic Resource
    Electronic Resource
    Aromatic polyesters. I. Synthesis and characterization of poly(4,4′-thiodiphenyl phthalate)s (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 73-82 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Poly(4,4′-thiodiphenyl phthalates) (iso/tere) have been synthesized using both low temperature step-growth and phase-transfer catalyzed polymerization techniques. These polymers were characterized using conventional techniques like elemental analysis, solubility characteristics, X-ray diffraction, infrared, and proton nuclear magnetic resonance spectroscopy. 4,4′-Thiodiphenyl dibenzoate was used as a model compound.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390107
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    Paper (German National Licenses)
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  • 2
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    Development of an integrated BEM approach for hot fluid structure interaction: BEST-FSI: Boundary Element Solution Technique for Fluid Structure Interaction (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: As part of the continuing effort at NASA LeRC to improve both the durability and reliability of hot section Earth-to-orbit engine components, significant enhancements must be made in existing finite element and finite difference methods, and advanced techniques, such as the boundary element method (BEM), must be explored. The BEM was chosen as the basic analysis tool because the critical variables (temperature, flux, displacement, and traction) can be very precisely determined with a boundary-based discretization scheme. Additionally, model preparation is considerably simplified compared to the more familiar domain-based methods. Furthermore, the hyperbolic character of high speed flow is captured through the use of an analytical fundamental solution, eliminating the dependence of the solution on the discretization pattern. The price that must be paid in order to realize these advantages is that any BEM formulation requires a considerable amount of analytical work, which is typically absent in the other numerical methods. All of the research accomplishments of a multi-year program aimed toward the development of a boundary element formulation for the study of hot fluid-structure interaction in Earth-to-orbit engine hot section components are detailed. Most of the effort was directed toward the examination of fluid flow, since BEM's for fluids are at a much less developed state. However, significant strides were made, not only in the analysis of thermoviscous fluids, but also in the solution of the fluid-structure interaction problem.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-189202 , NAS 1.26:189202
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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