Archive image from page 15 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 (a) Equatorial hatch. (b) Polar hatch. Figure 3. Basic approaches for providing access to the interior of a spherical acrylic plastic capsule. Since a metal hatch system constitutes a serious mismatch of rigidity with the acrylic plastic hull, a concentrated effort was made to reduce the thick- ness of the metal hatch to a minimum, so that the mismatch and resulting stress raiser effect could be minimized. The
Archive image from page 15 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 (a) Equatorial hatch. (b) Polar hatch. Figure 3. Basic approaches for providing access to the interior of a spherical acrylic plastic capsule. Since a metal hatch system constitutes a serious mismatch of rigidity with the acrylic plastic hull, a concentrated effort was made to reduce the thick- ness of the metal hatch to a minimum, so that the mismatch and resulting stress raiser effect could be minimized. The engineering decision was to reduce the thickness of the metal hatch to the minimum value corresponding in strength to implosion pressure of the acrylic plastic hull. One of the problems facing the designer in providing a metal hatch for the capsule was to find a means for firmly attaching the beveled metal hatch insert ring to the acrylic plastic hull so that the whole hatch assembly would not fall out when the capsule was tossed around on the ocean surface. An inge- nious solution was found: secure the hatch insert ring to the acrylic plastic hull by means of a metal retainer flange located on the interior of the hull to which the hatch insert ring would be bolted. Direct contact between the metal retainer flange and the acrylic plastic hull was considered undesirable as it would lead to scoring of the acrylic plastic, and local stress concentrations when the curvature of the capsule decreased during hydrostatic loading. To forestall these conditions, a compliant rubber gasket would be interposed between the metal retaining flange and the acrylic plastic hull. In addition, the retaining flange would be provided with a convex spherical surface matching the concave interior curvature of the capsule. The flange cross- section was to decrease towards its outer edge to make the flange more compliant at the outer edge than at the inner edge at the bolt circle. 12
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Keywords: 1970, archive, book, bookauthor, bookdecade, bookpublisher, booksponsor, booksubject, bookyear, boston_library_consortium_member_libraries, drawing, historical, history, hulls_naval_architecture_, illustration, image, naval_civil_engineering_laboratory_port_hueneme_calif, page, picture, port_hueneme_calif_u_s_naval_civil_engineering_lab, print, reference, stachiw_jerry_d_1931_, submersibles, vintage
