. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. 800 ~ 700 a 0 600 1 500 1 400 % 300 8 $ 200 > 1 100. Notes: 1. Pressurizatlon rate— 4. Sphere dimensions—66-in. 16 psi/min OD x 61-in. ID 2. Temperature—65 to 68°F 5. Material—grade G Plexiglas 3. Total Internal volume— js2,000 liters 30 40 50 Volume Displaced (liters) Figure 105. Change in displacement of 66-inch-diameter capsule under short-term loading. 2. The relaxation periods at zero pressure, which were chosen for all pressure cycles to be equal in length o
. Development of a spherical acrylic plastic pressure hull for hydrospace application. Hulls (Naval architecture); Submersibles. 800 ~ 700 a 0 600 1 500 1 400 % 300 8 $ 200 > 1 100. Notes: 1. Pressurizatlon rate— 4. Sphere dimensions—66-in. 16 psi/min OD x 61-in. ID 2. Temperature—65 to 68°F 5. Material—grade G Plexiglas 3. Total Internal volume— js2,000 liters 30 40 50 Volume Displaced (liters) Figure 105. Change in displacement of 66-inch-diameter capsule under short-term loading. 2. The relaxation periods at zero pressure, which were chosen for all pressure cycles to be equal in length or longer than the duration of sustained pressure periods, appeared to be sufficiently long for all strains to return to zero (Figure 107). Thus, the magnitude of strains in acrylic at the initiation of each pressure cycle rose by the last cycle from zero to only 100 This took place regardless of whether the length of each cycle was 2, 15 or 60 minutes. Long-term strains were also recorded at 27 locations while the hull was subjected to long-term loading of 24-hour duration at 100-, 200-, 300-, 400-, 500-, 600-, 700-, and 800-psi external hydrostatic pressure. Since the relaxation periods were sufficiently long between each long-term pressurization to allow for a complete relaxation of the hull, the recorded strain data was not considered to be contaminated by viscoelastic strains still undergoing relaxa- tion when the next pressure cycle was initiated. 1. At room temperature, the magnitude of strains in the equatorial region under long-term hydrostatic loading after a given duration of sustained loading appears to vary linearly with pressure. To what maximum pressure this relationship remains linear is not known, as the long-term pressure tests were conducted only to 800 psi, at which pressure the relationship still con- tinued to be linear (Figures 108, 109, 110). 2. Upon depressurization, the strains in the equatorial region returned almost to zero, even
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