Accession Number : ADA308225

Title :   Investigation of Structural Properties of Fiber-Glass Filament-Wound Pressure Vessels at Cryogenic Temperatures.

Descriptive Note : Rept. for 1 Jul 63-16 Jun 65,

Corporate Author : DOUGLAS AIRCRAFT CO INC SANTA MONICA CA MISSILE AND SPACE SYSTEMS DIV

Personal Author(s) : Toth, J. M., Jr. ; Sherman, W. C. ; Soltysiak, D. J.

PDF Url : ADA308225

Report Date : SEP 1965

Pagination or Media Count : 135

Abstract : Preliminary investigations of the structural properties of fiber-glass, filament-wound composites have shown that these materials have a great deal of promise for vessels that are structurally more efficient for storing fluids under pressure in a cryogenic environment than present vessels of metallic materials. This investigation was made to determine such structural properties through the use of a typical 18-in.-diam pressure test vessel. It was realized at the outset that providing a suitable liner would be a major problem. Accordingly, the initial effort dealt with the testing of various candidate liner materials. Data were obtained on mechanical properties, permeability, thermal contraction, and cyclic resistance of poly meric and electrodeposited metallic materials. During the initial liner evaluation, it was found that the strength of S-994 glass filaments in a 7-1/2-in. - diam biaxial cylinder increased approximately 20% when tested at -423 deg F compared to its strength at +75 deg F. The number of cycles that can be achieved by a pressure vessel operating in the range of 1 to 2-1/2% strain is dependent upon the ability of the bond between the vessel wall and liner to prevent the liner from buckling and upon the ability of the liner to resist fracture when subjected to high plastic tensile and compressive strains. The investigated polymeric films had a low total elongation which, coupled with their high differential-contraction rates as compared with the glass-resin composites, made them unsuitable for liners in filament-wound pressure vessels operating at high strains and designed to take all of the strain in tension. A large number of cycles were achieved with a 7-l/2-in.-diam biaxial cylinder containing a 5-mil electrodeposited-nickel liner cycled at approximately 0.8% strain with liquid hydrogen.

Descriptors :   *FILAMENT WOUND CONSTRUCTION, *FIBER REINFORCED COMPOSITES, *CRYOGENICS, THERMAL PROPERTIES, STRESS STRAIN RELATIONS, FIBERGLASS, PERMEABILITY, POLYMERS, COMPOSITE MATERIALS, THIN FILMS, COMPOSITE STRUCTURES, STRENGTH(MECHANICS), CYLINDRICAL BODIES, POLYMERIC FILMS, PRESSURE VESSELS, BONDING, BIAXIAL STRESSES, ELONGATION, WINDING, ELECTRODEPOSITION.

Subject Categories : Laminates and Composite Materials
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE