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  • 1
    facet.materialart.
    Unknown
    Preparation of cast aluminum alloy-mica particle composites (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A method for making aluminum-mica particle composites is presented in which mica particles are stirred in molten aluminum alloys followed by casting in permanent molds. Magnesium is added either as an alloying element or in the form of pieces to the surface of the alloy melts to disperse up to 3 wt% mica powders in the melts and to obtain high recoveries of mica in the castings. The mechanical properties of the aluminum alloy-mica composite decrease with increasing mica content; however, even at 2.2% it has a tensile strength of 14.22 kg/sq mm with 1.1% elongation, a compression strength of 42.61 kg/sq mm, and an impact strength of 0.30 kgm/sq cm. Cryogenic and self-lubricating bearing are mentioned applications.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Materials Science; 15; May 1980
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    A theoretical investigation of noise reduction through the cylindrical fuselage of a twin-engine, propeller-driven aircraft (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Interior noise in the fuselage of a twin-engine, propeller-driven aircraft with two propellers rotating in opposite directions is studied analytically. The fuselage was modeled as a stiffened cylindrical shell with simply supported ends, and the effects of stringers and frames were averaged over the shell surface. An approximate mathematical model of the propeller noise excitation was formulated which includes some of the propeller noise characteristics such as sweeping pressure waves around the sidewalls due to propeller rotation and the localized nature of the excitation with the highest levels near the propeller plane. Results are presented in the form of noise reduction, which is the difference between the levels of external and interior noise. The influence of propeller noise characteristics on the noise reduction was studied. The results indicate that the sweep velocity of the excitation around the fuselage sidewalls is critical to noise reduction.
    Keywords: ACOUSTICS
    Type: NASA-TP-1325 , L-12225
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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