INFLUENCE OF LENGTH-TO-DIAMETER RATIO ON BEHAVIOR OF CONCRETE CYLINDRICAL HULLS UNDER HYDROSTATIC LOADING,
 Technical Report R 696, Naval Civil Engineering laboratory, Port Hueneme, CA, by H.H. Haynes and R.J. Toss, September 1970, 50 pages.

Fourteen hollow concrete cylindrical hulls ranging in length from 8 to 128 inches and having an outside diameter of 16 inches and a wall thickness of 2 inches were subjected to hydrostatic loading to determine: (1) the effect of cylinder length-to-outside-diameter ratio (L/D.) on the implosion pressure and strain behavior, and (2) the distance from the edge of the cylinder in which radial displacement was influenced by the end closure. Hemispherical end closures were joined to the cylinders with epoxy, silicone rubber, or steel dowel pins and epoxy. The uniaxial compressive strength of the concrete averaged approximately 9,500 psi. Test results showed that the ratio of implosion pressure to uniaxial concrete strength, Pim/f,, decreased as the L/Do ratio increased from 0.5 to 2, and then the Pim /f' ratio became constant. Thus, an "infinitely long cylinder" was one having an L/Do ratio >, 2, the effect of the end closure on the behavior of the cylinder becoming negligible at a distance >, I diameter from its edge.

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