Accession Number : ADA023515

Title :   Spherical Sector Windows with Restrained Edges for Undersea Applications.

Descriptive Note : Research rept. Jun 72-Jun 75,

Corporate Author : NAVAL UNDERSEA CENTER SAN DIEGO CALIF

Personal Author(s) : Stachiw,J. D.

Report Date : DEC 1975

Pagination or Media Count : 146

Abstract : 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.

Descriptors :   *WINDOWS, *SUBMERSIBLES, ACRYLIC RESINS, SPHERES, FLANGES, MOUNTING BRACKETS.

Subject Categories : MARINE ENGINEERING
      SUBMARINE ENGINEERING

Distribution Statement : APPROVED FOR PUBLIC RELEASE

Search DTIC's Public STINET for similiar documents.

Members of the public may purchase hardcopy documents from the National Technical Information Service.