Investigation of Closures and Closure Attachments for Grp Cylindrical Deep Submergence Vessels

摘要

The objectives of the program were to evaluate glass reinforced plastic (GRP) spheres and cylindrical shells with titanium hemispherical closures for deep diving submersible vessels. The design operating depth was 20,000 feet (8889 psi). Filament wound spherical models having a 6 inch ID and cylindrical models having hemispherical end closures 6 inches ID by 20 inches cylindrical shell length were designed, fabricated, and externally hydrostatic pressure tested both statistically and cyclic (fatigue). A total of eight spherical models were evaluated, six of which were tested hydrostatically to failure and two cyclic to failure. The spherical models were fabricated from both S-HTS glass and hollow glass with U. S. Polymeric E787 epoxy resin. All spherical models had two titanium reinforced openings. Three cylindrical shell models of sandwich wall construction (S-HTS/E787 faces and hollow glass/E787 core) were evaluated, one was tested hydrostatically to failure and two were subjected to 5000 cycles (one minute dwell at operating pressure) prior to hydrostatic testing to failure. All models were instrumented with strain gages so that analytical and experimental strains could be compared. (Author)