Archive image from page 217 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 6,000 4,000 2,000 capsule 0 (50-psi/min pressurization rate) I I capsule 1 (22-psi/min pressurization rate) Notes: 1. Dimension of capsules—66-in. OD x 61-in. ID 2. Ambient temperature—68 to 72°F 3. Sustained pressure—500 psi 4. Strains measured at the equator on the interior surface 100 150 Time (minutes) 200 Figure F-5. Comparison of strains on the interior surface of the NEMO capsules under long term 50
Archive image from page 217 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 6,000 4,000 2,000 capsule 0 (50-psi/min pressurization rate) I I capsule 1 (22-psi/min pressurization rate) Notes: 1. Dimension of capsules—66-in. OD x 61-in. ID 2. Ambient temperature—68 to 72°F 3. Sustained pressure—500 psi 4. Strains measured at the equator on the interior surface 100 150 Time (minutes) 200 Figure F-5. Comparison of strains on the interior surface of the NEMO capsules under long term 500 psi hydrostatic loading. RECOMMENDATIONS The specifications and drawings used in the production of three capsules by the contractor were generally satisfactory; however, as result of the experience gained in the fabrication of the three capsules, the follow- ing specification changes should be introduced: 1. Decrease the tolerance on the diameter to ;D< inches. 2. Increase the tolerance on the thickness of the finished hull to ;t< inches. 3. Increase the tolerance on the chord length between nonadjacent pentagon tips to ; K< inches. 4. Increase the minimum tensile strength requirement of the joint from 4,000 psi to 5,000 psi. 5. Increase the tolerance on the thickness of the acrylic plastic discs prior to forming to ;t< inches. 214
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