Accession Number : ADA306613

Title :   Windows for External or Internal Hydrostatic Pressure Vessels. Part 1: Conical Acrylic Windows Under Short-Term Pressure Application.

Descriptive Note : Rept. for Aug 65-Jun 66,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s) : Stachiw, J. D. ; Gray, K. O.

PDF Url : ADA306613

Report Date : JAN 1967

Pagination or Media Count : 108

Abstract : Conical acrylic windows for fixed ocean-floor structures were placed under short-term loading (pressurization from zero to failure at a fixed rate). The windows, of different thicknesses and different included conical angles, were subjected to various applied pressures and their subsequent behavior was studied. Acrylic windows, in the form of truncated cones with included angles of 30 deg, 60 deg, 90 deg, 120 deg, and 150 deg, were tested to destruction at ambient room temperature by applying hydrostatic pressure to the base of the truncated cone at a continuous rate of 650 psi/min. The pressure at which the windows failed and the magnitude of displacement through the window mounting at different pressure levels were recorded. The ultimate strength of the conical windows (denoted by the critical pressure at which actual failure occurred) was found to be related both to thickness and included conical angle. Graphs are presented defining the relationships of critical pressure versus thickness-to-diameter ratio, and pressure versus magnitude of displacement for the windows. Nondimensional scaling factors for critical pressure and displacement applicable to large-diameter windows are discussed and presented in graphic form. This initial study produced design criteria for conical acrylic windows for any ocean depth under conditions of short-term loading. These criteria may be applied to windows in either an internal pressure vessel used to contain high pressures, and thus simulate the ocean environment, or an external one used to resist high pressures, such as deep submergence structures in the ocean.

Descriptors :   *ACRYLIC RESINS, *WINDOWS, *UNDERWATER STRUCTURES, *HYDROSTATIC PRESSURE, THICKNESS, TENSILE STRENGTH, DISPLACEMENT, HIGH PRESSURE, STRENGTH(MECHANICS), FLANGES, PRESSURE VESSELS, PRESSURIZATION, TOLERANCES(MECHANICS), COMPRESSIVE STRENGTH, SUBMARINES, PLASTICS, CONICAL BODIES, OCEAN BOTTOM, INTERNAL PRESSURE, DEEP SUBMERGENCE.

Subject Categories : Plastics
      Structural Engineering and Building Technology
      Fluid Mechanics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE