142 55 



At values of deflection below about 0.2a the energy values thus estimated are 



definitely too large. More exact graphical determinations can be made if the 



pressure-deflection curve for a single thin circular plate of the material is 

 known as in Figures 43 and 4U. 



REFERENCES 



(TO) "Early and Ultimate Damage due to Underwater Explosions 

 against l 0-inch Diaphragms," by G.E. Hudson, Ph.D., TMB CONFIDENTIAL Report 

 509, August 1943. 



(13) "Protection against Underwater Explosion, Plastic Deformation 

 of a Circular Plate," by A.N. Gleyzal, Ph.D., TMB Report U90, September 19U2. 



(1U) "Plastic Strain and Deflection Tests on Clamped Circular 

 Steel Plates 20 Inches in Diameter," by A.N. Gleyzal, Ph.D., TMB Report 

 R-1U2, in preparation. 



(15) "Normal Pressure Tests of Circular Plates with Clamped Edges," 

 by Albert E. McPherson, Walter Ramberg, and Samuel Levy, NACA Technical Notes 

 8U8, June 1942. 



(16) "Description of Stress-Strain Curves by Three Parameters," 



by Walter Ramberg and William R. Osgood, NACA Technical Notes 902, July 19^3. 



(17) "A Rational Definition of Yield Strength," by William R. 

 Osgood, Journal of Applied Mechanics, Vol. 7. Number 2, June 19*^0. 



