. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. 3. All of the steel end closure components except for the top hatch ring and associated split retaining rings showed extensive plastic deformation (Figure 117) indicating that the large-scale polar steel closures underwent plastic buckling at approximately the same pressure as the model scale steel closures which failed at 1,800 psi (Figure 80). This validates the linear scaling factor (diameter of prototype capsule/diameter of model capsule) used in the scaling up o
. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. 3. All of the steel end closure components except for the top hatch ring and associated split retaining rings showed extensive plastic deformation (Figure 117) indicating that the large-scale polar steel closures underwent plastic buckling at approximately the same pressure as the model scale steel closures which failed at 1,800 psi (Figure 80). This validates the linear scaling factor (diameter of prototype capsule/diameter of model capsule) used in the scaling up of model capsule end plates for use in the 66-inch prototype NEMO Figure 117. Steel polar closure assemblies from the imploded 66-inch-diameter capsule. 4. The general implosion of the prototype NEMO capsule was triggered by the plastic buckling of the bottom plate. This finding is supported by the fact that (a) only on the bottom plate were the hatch retaining rings twisted, (b) only on the bottom plate was the spherical beveled bearing surface severely distorted, (c) only the bottom polar pentagon had its beveled bearing surface severely damaged (Figures 118 and 119), (d) rosette 3 mounted at the location where plastic hinge in the bottom plate formed showed the highest stress level during previous tests to 500 psi. 5. Since the buckling of the hatch and of the bottom plate was plastic rather than elastic, it can be avoided at pressures less than 2,000 psi by sub- stituting material with a yield point above 60,000 psi for the type 316 stainless steel used in the prototype. 150. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stachiw, Jerry D. , 1931-; Naval Civil Engineering Laboratory (Port Hueneme, Calif. ). Port Hueneme, Calif. : U. S. Naval Civil Engineering Laboratory
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