344 



corresponding to the smallest value of A- , etc. 



In Figures 1, 2, 3, and 4 some of the data from the above tables 

 is presented for the special case of the UERL diaphragm gauge. For this 

 case we have the 



thickness = 0,078 in, 



radius = 1.675 in. 



yield stress « 50,000 p.s.i, 



and density = 7,8 gm./cm^. 



These specifications of the di^hragm and a value of 1.007 gm./cm^. for the 

 density of sea water at 20° C. yield a value of 2.75 for X and 4,94 msec,~ 

 for <Oq • Specimen values of the maxLmum central deflection z^^ and the time 

 of deflection "t^ , for typical values of p,^ and d , are given in the fol- 

 lowing table: 



(msec.) (p.s.i.) (in.) (msec.) 



0.101 4000 0.49 0,29 



,505 2000 ^.49 p.36 



i 



.01 2000 5>C57 /.39 



In the above tables and graphs the profile for "6/6^^ « l is rather 

 peaked in the case of O small suid resembles a circular arc in the case of 

 9 large (in particular, compare figures 1 and 3)» In the case of small^ 

 the peaked condition is what one shoxild expect since in the case of impulsive 

 loading the diaphragn would tend to be deflected to a conical shape, if the 

 water loading were evenly distributed. In the case of e large the resem- 

 blance of the profile to a circular arc is easy to see if one considers the 

 fact that the diaphragn under the influence of a static pressure is deflected 



35 



