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  • PACS: 79.20.DS; 81.90.+c; 78.90.+t  (1)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • 1995-1999  (1)
  • 1975-1979  (1)
  • 1
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    The response of the Space Shuttle Orbiter graphite/epoxy sandwich panels to exposure to moisture and heat (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Shuttle Orbiter Payload Bay Door is covered with graphite/epoxy sandwich panels. Their interaction with ground environments causes a moisture absorption of approximately 1.0% by weight at the time of launch. During the reentry phase the temperature of the outer facesheets rises to 177 C and their moisture content diminishes to 0.65%. In this condition the facesheet strength deteriorates significantly. Also, desorption of moisture produces an internal pressure in the panels of ca. 345 kPa. The paper discusses the prediction of expected moisture levels in the constituent parts of the sandwich panels. It describes further the test program necessary to assess the residual strength of the facesheets and the internal pressure capability of the sandwich panels.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: International Council of the Aeronautical Sciences, Congress; Sep 10, 1978 - Sep 16, 1978; Lisbon; Portugal
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    Electronic Resource
    Electronic Resource
    Physical and material aspects in using visible laser pulses of nanosecond duration for ablation (1996)
    Springer
    Applied physics 63 (1996), S. 123-131 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 79.20.DS; 81.90.+c; 78.90.+t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Interaction phenomena of 50 ns copper vapour laser pulses (λ=511/578 nm) with matter are investigated. The basic ablation process is classified into four fundamental classes. On basis of this classification processing results are connected with specific material properties like the brittleness, the viscosity of the melt or the optical properties. Knowing these properties a prognosis of the expected fundamental process is possible. In order to generate a geometrically defined structure via ablation in a given material-specific process, strategies have to be developed. Typical examples for process strategies are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567639
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    Paper (German National Licenses)
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