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DTIC ADA305279: Investigation of Smooth-Bonded Metal Liners for Gla... |
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by Defense Technical Information Center |
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Filament-wound fiberglass has been recognized for some |
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time as a potential structure for storing fluids under |
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pressure in a cryogenic environment. The highest |
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potential is realized with a thin, smooth-bonded, |
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metallic liner. The number of cycles that can be achieved |
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with such a liner, however, is dependent upon the ability |
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of the adhesive to prevent the liner from buckling and |
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upon the ability of the liner to resist fracture when |
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subjected to high, plastic, tensile-compressive strains. |
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The goal of this investigation was the development of a |
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liner-adhesive system, which when incorporated into a |
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vessel, would withstand repeated cyclic loadings over a |
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temperature range of +75 deg F to -423 deg F. Various |
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adhesive systems were evaluated in preliminary coupon |
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testing. A blended polyurethane:epoxy (70:30 pbw) resin |
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with a glass scrim cloth system was selected for further |
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testing in a 1:1 biaxial pressure vessel. A thin aluminum |
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liner performed well (100 pressure cycles to 2% strain) |
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with the adhesive at -423 deg F, but at ambient |
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temperature, aluminum liners and a nickel liner buckled |
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and failed. On the basis of these results, a |
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reorientation was made to further develop an adhesive |
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system to satisfactorily bond the liner at both ambient |
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temperature and -423 deg F. The use of a thin nylon scrim |
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in the adhesive, in place of the glass scrim, improved |
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the ambient temperature performance of the 70:30 blend |
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adhesive, while at the same time, it did not cause a |
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degradation in the -423 deg F performance (10 pressure |
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cycles to 2% strain; this was with aluminum liners; |
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nickel work was discontinued). An 80:20 blend adhesive |
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(with nylon scrim) also performed satisfactorily. The |
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primary liner in all cases remained satisfactorily bonded |
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to the structural wall. However, at -423 F, in all cases, |
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leakage occurred through the bonded longitudinal seam. |
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(MM) |
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Date Published: 2018-03-29 16:15:18 |
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Identifier: DTIC_ADA305279 |
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Item Size: 193516814 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Toth, J. M., Jr.; DOUG... |
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