LIST OF FIGURES 



Page 



Figure 1 - ALVIN Pressure Hull 3 



Figure 2 - Experimental Buckling Data for Machined Deep Spherical 



Shells with Ideal Boundaries 6 



Figure 3 - Experimental Inelastic Buckling Data for Machined 

 Shallow and Deep Spherical Shells with Clamped 

 Edges 7 



Figure 4 - Assumed Relationship between Out-of-Roimdness A and 



Local Radius R-. 10 



Figure 5 - Relationship between R/r and A/h 11 



1 ^ 

 Figure 6 -Machined Models with Imperfections 11 



Figure 7 - Experimental Buckling Data for Machined Models with 



Imperfections 12 



Figure 8 - Typical Conqjressive Stress-Strain Curves for HY-100 

 Steel Material Used in Fabrication of ALVIN Pressure 

 Hulls lU 



Figure 9 - Representative Material Characteristics 1^ 



Figure 10 - Hull Thickness Measurements l6 



Figure 11 - Instrument Used in Measuring Departures from 



Sphericity 19 



Figure 12 - Deviations from Sphericity 21 



Figure 13 - Location of Penetrations and Girth Welds 28 



Figure 14 - Arc Length Scales 30 



Figure 15 - Sairple Calculation Sheet for Determining Ratio of 



R^/R 3U 



