behavior of the test specimens with good accuracy (Appendix B). Fig- 

 ure 3, which is the design chart for implosion, is within 10% accuracy 

 of the finite element method predictions . 



3. The design chart of Figure 3 can be applied for quickly deter- 

 mining the implosion strength for a concrete cylinder structure of given 

 dimensions. 



ACKNOWLEDGMENTS 



EXXON Production Research Company is acknowledged for their 

 CO- sponsorship of the thin-walled cylinder test program. 



At CEL, Roy S. Highberg and Phihp C. Zubiate are recognized for 

 conducting tests on both the thin- and thick-walled cylinder specimens. 

 Other participants were Joseph F . Wadsworth , Joseph Graham , Gene 

 McMahan, and Michael Hanks. 



REFERENCES 



1. Civil Engineering Laboratory. Technical Report R-517: Behavior 

 of spherical concrete hulls under hydrostatic loading, Part 1. Explora- 

 tory Investigation, by J. D. Stachiw and K. O. Gray. Port Hueneme, 

 Calif., Mar 1967. (AD 649290) 



2. . Technical Report R-696: Influence of length-to- 

 diameter ratio on the behavior of concrete cylindrical hulls under hydro- 

 static loading, by H. H. Haynes and R. J. Ross. Port Hueneme, 

 Calif., Sep 1970. (AD 713088) 



3. . Technical Report R-740: Influence of end-closure 



stiffness on behavior of concrete cylindrical hulls subjected to hydro- 

 static loading, by L. F. Kahn. Port Hueneme, Calif., Oct 1971. (AD 

 732363) 



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