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U. S. Naval Civil Engineering Laboratory 



WINDOWS FOR EXTERNAL OR INTERNAL HYDROSTATIC PRESSURE 



VESSELS - PART II. Flat Acrylic Windows Under Short-Term Pressure 



Application, by J. D. Stachiw, G. M. Dunn, and K. O. Gray 



TR-527 77 p. illus May 1967 Unclassified 





 















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disk-shaped acrylic windows of different thickness-to-diameter ratios hove been tested 

 ction under short-term hydrostatic loading at room temperatures, where short-term loading 

 d OS pressurizing the window hydrostatically on its high-pressure face at a 650-psi/minute 

 failure of the window takes place. Critical pressures and displacements of windows with 

 s to effective diameter ratios less than 1.0 have been recorded and plotted. The critical 

 ; derived from testing flat windows in flanges with 1.5-inch, 3.3-inch, and 4.0-inch 

 i have been found applicable also to flanges with larger openings, so long as the larger 

 are of the same t/D| and D^/D; ratios, where t is thickness of the window, D; is the 

 ening in the flange and therefore the effective diameter of the window exposed to ambient 

 ;ric pressure and D^ is overall diameter of the window face exposed to hydrostatic pressure, 

 ormance of flat windows under short-term hydrostatic pressure has been found to be corn- 

 to that of conical windows with included angle equal to, or larger than 90 degrees. 



U. S. Naval Civil Engineering Laboratory 



WINDOWS FOR EXTERNAL OR INTERNAL HYDROSTATIC PRESSURE 



VESSELS - PART II. Flat Acrylic Windows Under Short-Term Pressure 



Application, by J. D. Stachiw, G. M. Dunn, and K. O. Gray 



TR-527 77 p. illus May 1967 Unclassified 





 



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, disk-shaped acrylic windows of different thickness-to-diameter ratios have been tested 

 jction under short-term hydrostatic loading at room temperatures, where short-term loading 

 3d as pressurizing the window hydrostatically on its high-pressure face at a 650-psi/minute 



failure of the window takes place. Critical pressures and displacements of windows with 

 ;s to effective diameter ratios less than 1.0 have been recorded and plotted. The critical 

 s derived from testing flat windows in flanges with 1.5-inch, 3.3-inch, and 4.0-inch 

 s have been found applicable also to flanges with larger openings, so long as the larger 

 s are of the same t/D; and Dq/D; ratios, where t is thickness of the window, D; is the 

 jening in the flange and therefore the effective diameter of the window exposed to ambient 

 eric pressure and D^ is overall diameter of the window face exposed to hydrostatic pressure 

 formance of flat windows under short-term hydrostatic pressure has been found to be com- 



to that of conical windows with included angle equal to, or larger than 90 degrees. 









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ave been tested 

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 xposed to ambient 

 /drostatic pressure 

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lave been tested 

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 a 650-psi/minute 

 of windows with 

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 ind 4.0-inch 

 ig OS the larger 

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disk-shaped acrylic windows of different thickness-* 

 ction under short-term hydrostatic loading at room te 

 d as pressurizing the window hydrostatically on its hi 

 failure of the window takes place. Critical pressure: 

 i to effective diameter ratios less than 1.0 have been 

 derived from testing flat windows in flanges with l.i 

 hove been found applicable also to flanges with lore 

 are of the same t/D; and Dq/D; ratios, where t Is th 

 aning in the flange and therefore the effective diame 

 ;ric pressure and Dq Is overall diameter of the windo\ 

 ormance of flat windows under short-term hydrostatic 

 to that of conical windows with included angle equal 



Engineering Laborato 

 TERNALOR INTERN 

 . Flat Acrylic Windo 

 D. Stachiw, G. M. D 

 77 p. illus 



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f different thickness- 

 He loading at room te 

 drostotically on its hi 

 ce. Critical pressure 

 ss than 1.0 have been 

 iws In flanges with \ .t 

 50 to flanges with Ion 

 i] ratios, where t is tl 

 e the effective diame 

 liameter of the windo 

 ihort-term hydrostatic 

 included angle equa 



WINDOWS FOR EX 

 VESSELS - PART II, 

 Application, by J. 

 TR-527 



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U. S. Naval Civil 

 WINDOWS FOR EX 

 VESSELS - PART II 

 Application, by J. 

 TR-527 



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disk-shaped acrylic windows 

 iction under short-term hydrostol 

 id as pressurizing the window hy 

 failure of the window takes plai 

 s to effective diameter ratios le: 

 i derived from testing flat windo 

 ; hove been found applicable al: 



are of the same t/D; and D^/D 

 ening in the flange and therefor 

 eric pressure and D^ is overall d 

 ormance of flat windows under ! 

 to that of conical windows with 



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 openings 

 windows 

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P .^ E i S. S- S 1; a i^ 8. 



