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  • 1985-1989  (4)
  • 1
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    Unknown
    RESISTANCE OF 129/J MICE TO SCHISTOSOMA MANSONI INFECTION (1986)
    Wiley
    Details
    Publication Date: 1986-08-01
    Print ISSN: 0004-945X
    Topics: Biology , Medicine
    Published by Wiley
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    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Cryogenic insulation strength and bond tester (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method and apparatus for testing the tensile strength and bonding strength of sprayed-on foam insulation attached to metal cryogenic fuel tanks is described. A circular cutter is used to cut the insulation down to the surface of the metal tank to form plugs of the insulation for testing in situ on the tank. The apparatus comprises an electromechanical pulling device powered by a belt battery pack. The pulling device comprises a motor driving a mechanical pulling structure comprising a horizontal shaft connected to two bell cracks which are connected to a central member. When the lower end of member is attached to a fitting, which in turn is bonded to a plug, a pulling force is exerted on the plug sufficient to rupture it. The force necessary to rupture the plug or pull it loose is displayed as a digital read-out.
    Keywords: STRUCTURAL MECHANICS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Alignment and assembly tool for very large diameter cylinders (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An alignment and assembly tool is disclosed for aligning the ends of two very large cylinders so that the ends may be welded with a cylindrical strengthening section inserted between the cylinders and aligned and welded into the joint. The tool has a U-shaped main body with a horizontal top section and two legs, which are attached to the ends of the top section and extend outward and downward. Horizontal bottom sections extend outward from the bottoms of two of the legs. The tool has one inner jackscrew and one outer jackscrew on each side of its center, extending downward from the top section. Each of the two bottom sections has an attached side clamp for clamping the alignment tool to two opposing skin stringers of two of the cylinders. The jackscrews are adjusted to bring the edges of a tee ring into precise alignment with the ends of the two large cylinders so that both joints may be welded around their circumference.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Alining Large Cylinders for Welding (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Special tooling alines and holds internally-stiffened large-diameter cylindrical parts for welding. Alinement brackets attached to strengthening fins on insides of cylindrical tank sections. Jackscrews on brackets raised or lowered to eliminate mismatches between adjacent sections. Tooling substantially reduces costs while allowing more precise control and improved quality.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-28001 , NASA Tech Briefs (ISSN 0145-319X); 9; 2; P. 156
    Format: text
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    NASA TECHNICAL REPORTS
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