Photoelastic Analysis of Undersea Structures

by Stanley K. Takahashi,
Robert Mark,

Serial Information: Journal of the Structural Division, 1969, Vol. 95, Issue 3, Pg. 317-326

Document Type: Journal Paper


Stress distributions in sphere-cylinder transition regions of externally pressurized thick-walled vessels are studied. Data determined by two different approaches, photoelasticity and finite element computer programs, are compared. These approaches afford a capability for analyzing complicated deep ocean structures that are of considerable interest to the U.S. Navy. Two small-scale epoxy models of the prototype structures were loaded by external pressure and stress frozen. The first model had a cylinder radius-to-wall thickness ratio = 8 and incorporated 60% balanced opening reinforcement at the transition. The second had a cylinder radius-to-wall thickness ratio of 2.5 and 65% balanced reinforcement. After stress freezing, tie models were sliced longitudinally and transversely; meridional and circumferential stresses were determined photoelastically in a diffused-light polariscope. The experimental solutions verified stresses calculated by finite element computer programs.

Subject Headings: Stress distribution | Underwater structures | Finite element method | Computer software | Cylinders | Thickness | Walls | Ocean engineering

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