Windows for External or Internal Hydrostatic Pressure Vessels. Part 7. Effect of Temperature and Flange Configurations on Critical Pressure of 90- Degree Conical Acrylic Windows Under Short-Term Loading.
Final rept. Jun 1969-Jun 1970
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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Conical acrylic windows of 90-degree included angle and 0.083 to 0. 775 thickness- to-minor-diameter tD ratios have been tested to ultimate failure under short-term hydrostatic loading. The ambient temperature was varied from 32 F to 90 F and the relationship between minor window diameter D and minor window cavity diameter in the flange varied from 0.970 to 1.500. The test results show that the critical pressure of identical windows at 90 F is approximately 10 to 20 less than at 70 F, and at 32 F it is approximately 15 to 25 more than at 70 F. To improve the critical pressure of 90- degree conical acrylic windows, it is recommended that such windows be designed with a window flange mismatch ratio of greater than 1.00, the exact magnitude depending on the windows tD ratio, service, and design considerations.
- Marine Engineering