524 



used in the tests herein reported vas from five separate lots; the 

 physical properties of the various lots are given in Table I. Yield 

 stresses and tensile strengths for the first four lots and Lot 5b are 

 quoted from the supplier's specifications; other Lot 5 values (in 

 parenthesis) for the yield stress and tensile strength were determined 

 at the David Taylor Model Basin. 



Table la. Physical properties of various steels 

 used In diaphragm gauge tests 



Lot 5 steel was used most extensively for this and other work 

 requiring sheet metal PJ . The three thicknesses were specially obtained 

 from the American Rolling Mill Company and sill were from the same melt 

 of steel and had compositions as uniform as possible. Additional tests 

 on part of Lot 5 by the Materials Testing Laboratory of Massachusetts 

 Institute of Technology furnished the data of Table lb. 



Table lb. Additional Lot 5 Data 



III. THEORETICAL PREDICTION OF DEFORMATION OF DIAPERACMS 



■Hie study of circular diaphragm deformation by means of fluid 

 pressure has been pursued on a theoretical basis by several groups. 



5/ J. C. Decius and Paul M. Pye, OSRD Report No. 6247, NDRC Report No. A-369. 



