Spherical Sector Windows with Restrained Edges for Undersea Applications.
Research rept. Jun 72-Jun 75,
NAVAL UNDERSEA CENTER SAN DIEGO CALIF
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A new concept for the mounting of spherical sector windows was experimentally evaluated under short-term, long-term, and cyclic pressure loadings. The new mounting concept requires that the spherical sector windows be provided with square edges instead of conical edges. The horizontal bearing surface of the square edge carries the axial thrust of the window and the vertical bearing surface the radial thrust. Experimental evaluation has shown that the spherical windows with square edges are subjected to larger flexure moments than similar windows with conical edges. However, the short-term critical pressures of spherical sector windows with square edges and included angles 75 degrees alpha 180 degrees were found to be only 10 percent less than similar windows with conical edges. For spherical sectors with alpha 75 degrees, square-edge mountings provides significantly higher short-term implosion pressures than conical edge mountings. Based on the short-term critical pressures, strains, stresses, and cyclic fatigue data generated by this study, the spherical shell sector windows with square-edge mountings are considered acceptable for service in manned submersibles, habitats, or diving bells.
- Marine Engineering
- Submarine Engineering