Accession Number : ADD013685

Title :   Low Modulus Damping Film.

Descriptive Note : Patent, Filed 3 Jun 86, patented 5 Jan 88,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Blaugher, Richard D ; Kolek, Robert L

Report Date : 05 Jan 1988

Pagination or Media Count : 4

Abstract : A film is disclosed which will accommodate high shear strain in a rigidly supported epoxy impregnated niobium stannide superconducting coil (SCC). In a generator application the SCC is subjected to a combined load due to differential thermal contraction, magnetic, and centrifugal forces. These strains could lead to coil fracture and resulting degradation of the field and current-carrying properties. A low modulus material at the interface between the SCC and support structure will reduce or distribute the shear strain to an acceptable level, i.e., no degradation in current carrying properties. Two film materials, polyethylene terephthalate Mylar (DuPont Chemical) and polycarbonate Makrofol KG (Mobay chemical) are disclosed as suitable damping or interface films. An adhesive such as the polyurethane Bostik 7070 is used for affixing the film to the winding surface.

Descriptors :   *POLYCARBONATES, *POLYETHYLENE TEREPHTHALATE, *POLYMERIC FILMS, *PATENTS, CENTRIFUGAL FORCE, COILS, CONTRACTION, CURRENTS, DAMPING, DEGRADATION, FRACTURE(MECHANICS), GENERATORS, INTERFACES, POLYURETHANE RESINS, SHEAR STRENGTH, STRAIN(MECHANICS), SUPPORTS, SURFACES, THERMAL PROPERTIES, WINDING

Subject Categories : Polymer Chemistry
      Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE