800 



200 



600 



400 

 Volume Displaced (ml) 



Figure 106. Comparison of displacement change measured on 66-inch-diameter 

 capsule and predicted displacement based on extrapolation of 

 displacement change data from 15-inch-diameter capsule under 

 short-term loading. 



3. The time-dependent strain rate varies with the pressure to which 

 the acrylic plastic hull is subjected during long-term loading. The relationship 

 between the time-dependent strain rate and pressure is probably exponential. 



4. Immediately after initiation of long-term pressure loading, the 

 strain and time-dependent strain rate were higher on the interior of the hull 

 in equatorial region than on the exterior of the hull. This was caused by the 

 presence of higher stresses on the interior of the hull at that time. (Figures 

 109 and 110). 



142 



