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  • 1
    facet.materialart.
    Unknown
    Equipment and techniques for rapid bonding of composites (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Rapid adhesive bonding concepts have been developed at NASA Langley which employ induction heating of thermoplastic composite matrices directly along the bond line and/or adherends without heating the entire structure, the supports, and the fixtures of the bonding assembly. Short term thermal cycling and water boil exposures have shown encouraging environmental stability for these rapid bonds. These bonding techniques have been extended to continuous seam bonding of metallic and composite panels with promising results for the bonding of both like and unlike adherends; the portability of the apparatus suggests that field repairs of damaged structures are possible.
    Keywords: MECHANICAL ENGINEERING
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Nonintrusive method and apparatus for monitoring the cure of polymeric materials (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The invention is a nonintrusive method of monitoring the cure of a polymeric material using an electromagnetic field to sense a change of resistance of the polymeric material in the electromagnetic field that occurs during curing. This change of resistance is used to vary the impedance of an alternating voltage power supply that produces the electromagnetic field and which change of impedance is measured periodically or continuously to monitor the cure of said polymeric material. The apparatus for practicing the method of this invention may include a nonintrusive sensing head providing an inner, electromagnetic core within an open ended outer pot formed of magnet material. The open end of the pot core is positioned from a selected area of the surface of a sheet of the polymeric material. An alternating voltage supply circuit includes an inductance coil around the electromagnetic core and capacitor connected in parallel with the inductance coil forms a resonant tank circuit when energized. The resulting change in resistance of the polymeric material opposite the open end, a function of the curing, is measured as a corresponding change in the impedance of the power supply circuit to thereby monitor the cure of the polymeric material in the selected area.
    Keywords: NONMETALLIC MATERIALS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Induction heating coupler and annealer (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An induction heating device includes a handle having a hollow interior and two opposite ends, a wrist connected to one end of the handle, a U-shaped pole piece having- two spaced apart ends, a tank circuit including an induction coil wrapped around the pole piece and a capacitor connected to the induction coil, a head connected to the wrist and including a housing for receiving the U-shaped pole piece, the two spaced apart ends of the pole piece extending outwardly beyond the housing, and a power source connected to the tank circuit. When the tank circuit is energized and a susceptor is placed in juxtaposition to the ends of the U-shaped pole piece, the susceptor is heated by induction heating due to a magnetic flux passing between the two ends of the pole piece.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
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    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Induction heating coupler (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An induction heating device includes a handle having a hollow interior and two opposite ends, a wrist connected to one end of the handle, a U-shaped pole piece having two spaced apart ends, a tank circuit including an induction coil wrapped around the pole piece and a capacitor connected to the induction coil, a head connected to the wrist and including a housing for receiving the U-shaped pole piece, the two spaced apart ends of the pole piece extending outwardely beyond the housing, and a power source connected to the tank circuit. When the tank circuit is energized and a susceptor is placed in juxtaposition to the ends of the U-shaped pole piece, the susceptor is heated by induction heating due to magnetic flux passing between the two ends of the pole piece.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
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  • 5
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    Unknown
    Toroid Joining Gun For Fittings And Couplings (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Hand-held gun used to join metal heat-to-shrink couplings. Uses magnetic induction (eddy currents) to produce heat in metal coupling, and thermocouple to measure temperature and signals end of process. Gun, called "toroid joining gun" concentrates high levels of heat in localized areas. Reconfigured for use on metal heat-to-shrink fitting and coupling applications. Provides rapid heating, operates on low power, lightweight and portable. Safe for use around aircraft fuel and has no detrimental effects on surrounding surfaces or objects. Reliable in any environment and under all weather conditions. Gun logical device for taking full advantage of capabilities of new metal heat-to-shrink couplings and fittings.
    Keywords: FABRICATION TECHNOLOGY
    Type: LAR-14278 , NASA Tech Briefs (ISSN 0145-319X); 16; 12; P. 77
    Format: text
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    NASA TECHNICAL REPORTS
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