Accession Number : ADA308404

Title :   Comparison of Polyester, Film-Yarn Composite, Balloon Materials Subjected to Shear and Biaxial Loading.

Descriptive Note : Contract rept.,

Corporate Author : SCHJELDAHL (G T) CO NORTHFIELD MN

Personal Author(s) : Niccum, R. J.

PDF Url : ADA308404

Report Date : JUN 1972

Pagination or Media Count : 54

Abstract : A series of candidate materials for use in large balloons was tested and their tensile and shear strength capabilities are compared. The tests were done in a cold box at -68 deg C (-90 deg F). Some of these materials were fabricated on a special machine called the Flying Thread Loom. This machine laminates various patterns of polyester yarn to a thin polyester film. The results show that the shear strength of materials change with the angle selected for the transverse yarns and substantial increases in biaxial load carrying capabilities compared to materials formerly used are possible. The loom capabilities and the test methods are discussed.

Descriptors :   *LAMINATES, *FIBER REINFORCED COMPOSITES, *POLYESTER PLASTICS, *YARNS, *BALLOONS, TENSILE STRENGTH, COMPOSITE MATERIALS, THIN FILMS, DEFLECTION, MATRIX MATERIALS, TEST EQUIPMENT, PRESSURE GAGES, SHEAR STRESSES, STRAIN GAGES, PARACHUTES, BIAXIAL STRESSES, TORQUE, AXIAL LOADS, SHEAR STRENGTH.

Subject Categories : Lighter-than-air Aircraft
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE