152 10 



Thus it will be observed that measurement of the final strains on 

 the diaphragm, coupled with the use of the octahedral shearing stress-strain 

 relations as obtained from a simple tensile test on a conventional coupon, 

 suffices to permit a calculation of the energy absorbed by the diaphragm. The 

 good agreement, in this case within 2 per cent, is further verification of 

 the utility of the octahedral shearing stress-strain relations as applied to 

 energy calculations. 



REFERENCES 



(1 ) "Progress Report on Underwater Explosion Research - Bureau of 

 Ships Symbol El 39 - Part 1 - A Method for Determining Energy Absorption of 

 Steel at High Rates of Loading," by M.A. Greenfield, TMB ■■■■■■■ Report 

 R-202, February 19^4, 



(2) "Plasticity," by A. Nadal, McGraw-Hill Book Company, 1931, 

 p. 75. 



(3) "Plastic Behaviour of Metals in the Strain-Hardening Range, 

 Part I,'' by A. Nadai, Journal of Applied Physics, Vol. 8, 1937, p. 205. 



(U) "increase of Stress with Permanent Strain and Stress-Strain 

 Relations in the Plastic State for Copper Under Combined Stresses," by E.A. 

 Davis, Journal of Applied Mechanics, 19^3, p. A-187. 



(5) "On the Determination of the Energy of Plastic Deformation 

 Absorbed In a Diaphragm," by G.H. Handelman and W. Prager, Applied Mathe- 

 matics Group, Brown University, for the Applied Mathematics Panel of the 

 National Defense Research Committee, July 19^3, pp. 3 and 9. 



