Unclassified 



DOCUMENT CONTROL DATA - R & D 



Navol Civil Engineering Laboratory 

 Port Hueneme, California 93041 



ified 



WINDOWS FOR EXTERNAL OR INTERNAL HYDROSTATIC PRESSURE VESSELS - PART II 

 Flat Acrylic Windows Under Short-Term Pressure Application 



:SCRIPTIVE NOTES (Type ot report and inclusive dates) 



Not final; January 1, 1966 to June 30, 1966 



middle initial, lee 



Stochiw, J. D. 

 Dunn, G. M. 

 Gray, K. 0. 



May 1967 



Y-F015-01-07-001 



NO(Sl (Any other numbers that may be assigned 



Distribution of this report is unlimited. Copies available at the Clearinghouse for Federol 

 Scientific & Technical Information (CFSTI), Sills Building, 5285 Port Royal Road, Springfield, 

 Va. 22151 - Price $3.00 



Naval Focilities Engineering Command 



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

 to destruction under short-term hydrostatic loading at room temperatures, where short-term loading 

 is defined as pressurizing the window hydrostatica lly on its high-pressure face at a 650-psi/minute 

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

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

 pressures derived from testing flat windows in flanges with 1.5-inch, 3,3-inch, and 4.0-inch 

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

 windows are of the some t/D| and D /Dj ratios, where t is thickness of the window, Dj is the clear 

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

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

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

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



DD,?r.J473 



S/N 0101-807. 



Unclassified 



