Archive image from page 19 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 forces due to lifting the capsule off the deck padeye —J padeye retaining bolts service module (power pack and winch) Another approach that was investigated and subsequently discarded was to attach the cap- sule to the service module by bolting on the metal penetrator plate where all of the feedthroughs were located (Figure 6). For this purpose, the penetrator plate would have to be located at the bottom of
Archive image from page 19 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 forces due to lifting the capsule off the deck padeye —J padeye retaining bolts service module (power pack and winch) Another approach that was investigated and subsequently discarded was to attach the cap- sule to the service module by bolting on the metal penetrator plate where all of the feedthroughs were located (Figure 6). For this purpose, the penetrator plate would have to be located at the bottom of the capsule so that it could resist best the upward force generated by the buoyancy of the capsule when attached to the negatively buoyant service module. Such an attach- ' ment would possess some good points: (1) rigidity, (2) equal resistance to upward and down- ward forces, (3) ease of design and fabrication, and (4) unobstructed visibility. It has, however, two serious disadvantages: (1) it would generate considerable tensile stresses in the acrylic plastic joints when the NEMO system is lifted out of water by means of a line attached to the top hatch insert ring, and (2) it would generate flexure stresses in the acrylic plastic capsule when underwater currents impinge upon the capsule rigidly attached to the service module, thus creating a moment loading on the capsule. Of these two disadvantages, the first is the more serious. Analysis of the shortcomings of the rigid attachment to the metal penetrator plate provided an approach to the problem that eliminated all the bad features of the previous design approach and retained all the good ones. In this design approach, the capsule was attached by bolting the metal pene- trator plate to the service module, but the tensile stresses across the bonded acrylic plastic joints generated by hoisting operations were eliminated by the incorporation of pretensioned tie rods connecting the hatch insert ring to the penetrator plate l
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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
