STRESS CONCENTRATIONS IN HULL SHAPES FROM SURFACE DISCONTINUITIES.
Final rept. 24 Oct 67-30 Apr 69,
WYOMING UNIV LARAMIE NATURAL RESOURCES RESEARCH INST
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Stresses in a sphere-cone-cylinder model of a manned underwater station were studied in this investigation. Data were obtained from a photoelastic model and from a finite element computer program to compare the stress concentration at the change in geometries and at the stiffener locations. A small-scale photoelastic plastic model was loaded under an internal pressure of 1 psi at a critical temperature of 270F and the stresses were frozen by slowly cooling the model. The cylinder diameter-to-thickness ratio was 95. The cone was made tangent to the partial sphere at the point of intersection however, the cone-cylinder intersection or change of surface continuity was rather sharp. Rectangular shaped internal radial stiffeners which has the same stiffness as the scaled-down T-shaped stiffeners were used. The highest stress occurred at the inner surface of the intersection of the conical section with the main cylinder. Recommendations are made to reduce the high stress concentrations, and general guidelines in the design of similar structures are presented. Author
- Structural Engineering and Building Technology