MODEL ICR REVISED 
; MODEL 1CR 
MODEL 4A REVISED 
MO 
ae MODEL 4A 
exp = EXPERIMENTAL COLLAPSE PRESSURE 
MODEL 7A : 
= 0.8 E(h/Ry)? / (1- V2)1/2* 
2 
eae ie . ae ’ 2 
Figure 6 - Nondimensional Plot of Experimental Results for 
Machined Near-Perfect STS Hemispherical Shells 
*P3 is empirical elastic buckling pressure for spherical shells developed from recent 
TMB tests and P. is equilibrium yield pressure where h is shell thickness, R is mean 
radius, Ry is outer radius, E is Young’s modulus, v is Poisson's ratio, and Py is 
average material yield stress. 
14 
