Accession Number : ADA305279
Title : Investigation of Smooth-Bonded Metal Liners for Glass Fiber Filament-Wound Pressure Vessels.
Descriptive Note : Rept. for 22 Jun 65-15 Feb 67,
Corporate Author : DOUGLAS AIRCRAFT CO INC SANTA MONICA CA MISSILE AND SPACE SYSTEMS DIV
Personal Author(s) : Toth, J. M., Jr. ; Soltysiak, D. J.
PDF Url : ADA305279
Report Date : MAY 1967
Pagination or Media Count : 137
Abstract : Filament-wound fiberglass has been recognized for some time as a potential structure for storing fluids under pressure in a cryogenic environment. The highest potential is realized with a thin, smooth-bonded, metallic liner. The number of cycles that can be achieved with such a liner, however, is dependent upon the ability of the adhesive to prevent the liner from buckling and upon the ability of the liner to resist fracture when subjected to high, plastic, tensile-compressive strains. The goal of this investigation was the development of a liner-adhesive system, which when incorporated into a vessel, would withstand repeated cyclic loadings over a temperature range of +75 deg F to -423 deg F. Various adhesive systems were evaluated in preliminary coupon testing. A blended polyurethane:epoxy (70:30 pbw) resin with a glass scrim cloth system was selected for further testing in a 1:1 biaxial pressure vessel. A thin aluminum liner performed well (100 pressure cycles to 2% strain) with the adhesive at -423 deg F, but at ambient temperature, aluminum liners and a nickel liner buckled and failed. On the basis of these results, a reorientation was made to further develop an adhesive system to satisfactorily bond the liner at both ambient temperature and -423 deg F. The use of a thin nylon scrim in the adhesive, in place of the glass scrim, improved the ambient temperature performance of the 70:30 blend adhesive, while at the same time, it did not cause a degradation in the -423 deg F performance (10 pressure cycles to 2% strain; this was with aluminum liners; nickel work was discontinued). An 80:20 blend adhesive (with nylon scrim) also performed satisfactorily. The primary liner in all cases remained satisfactorily bonded to the structural wall. However, at -423 F, in all cases, leakage occurred through the bonded longitudinal seam. (MM)
Descriptors : *FIBER REINFORCED COMPOSITES, *GLASS FIBERS, *EPOXY COMPOSITES, *EPOXY RESINS, *ADHESIVES, METALS, LOW TEMPERATURE, FILAMENT WOUND CONSTRUCTION, FIBERGLASS, DEGRADATION, NYLON, TOUGHNESS, STRAIN(MECHANICS), STRENGTH(MECHANICS), LININGS, ALUMINUM, BUCKLING, PRESSURE VESSELS, NICKEL, CURING, POLYURETHANE RESINS, FAILURE(MECHANICS), TENSILE TESTERS, CYCLIC LOADS, PEEL STRENGTH, MANDRELS, ELECTRODEPOSITION, POLYESTER FIBERS.
Subject Categories : Adhesives, Seals and Binders
Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE