20,000 





























/ 





16,000 











/ 











Pcr' 



18.59 



( "' ^ 



)-x 



^ / 



.20 



.17 

 '19 





14,000 



V D^xO.D.^ 































/ 



• IB 





in 12,000 

 a. 













/ 







z 













1 



















/ 







CE 

 0. 



UJ 



tn 

 a. 



< 



^ 8000 









/ 



Zl5 

 /.1 3 



16 















/ 









o 











/ 









6000 











/'2 



/ " 

















/.I 













2000 





^^ 



/" 











0.02 0.04 0.06 0.08 0.10 0.12 0.14 



MEAN SHELL THICKNESS 

 MIDPLANE DIAMETER 



Figure lb - Based on Mean Measured WaJ-1 Thickness 

 Figure 1 - Comparison of Experimental Collapse Pressure with Theory of Bresse and Bryan 



11 



