Investigation of Smooth-Bonded Metal Liners for Glass Fiber Filament-Wound Pressure Vessels.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1967
- Accession Number
- ADA305279
Entities
People
- D. J. Soltysiak
- J. M. Toth Jr.
Organizations
- Douglas