Accession Number : AD0615415

Title :   PHOTOELASTIC INVESTIGATION OF STRESSES IN A PENETRATED HEMISPHERE.

Descriptive Note : Final rept.,

Corporate Author : ALLIED RESEARCH ASSOCIATES INC CONCORD MASS

Personal Author(s) : Hamilton,Harold ; Becker,Herbert

Report Date : 21 DEC 1964

Pagination or Media Count : 35

Abstract : A photoelastic study was made to determine the influence of seat conditions on the stress distribution in a representative plastic window of a bathyscaph pressure vessel. Friction measurements were made for comparison of materials and surface finishes. Twodimensional tests established the general character of the stress distributions in the window, and threedimensional tests revealed the stresses in a scale model of the prototype. It was found that the threedimensional stress distribution in the region of the inner face of a plastic window, when tested in a steel sphere and loaded under external pressure, was similar to stresses in the two-dimensional models in that same region. The ratio of maximum stress to applied pressure was found to be 0.85 in the three-dimensional window model, which would also pertain to the prototype. This report includes a recapitulation of the data obtained on previous studies of the structural behavior of externally pressurized spherical vessels with window and hatch penetrations. The remaining window problems are identified and discussed, and recommendations are made for future projects. (Author)

Descriptors :   (*PHOTOELASTICITY, PRESSURE VESSELS), (*PRESSURE VESSELS, STRESSES), (*STRESSES, MATHEMATICAL ANALYSIS), HEMISPHERICAL SHELLS, PLASTICS, LOAD DISTRIBUTION, FRICTION, SURFACE PROPERTIES, PENETRATION, MODEL TESTS, STEEL, SPHERES, PRESSURE, ACRYLIC RESINS, EPOXY RESINS, POLARISCOPES

Distribution Statement : APPROVED FOR PUBLIC RELEASE