120° [| 120° 



rosette leg 

 alignment (typical) 



hoop direction 



internal framework 

 of the cage 



node numbers 



Note: 



Node locations have been determined by dividing the sphere into 

 2-degree increments. Numbering of nodes began on the bottom, 

 just as the numbering of the rosettes, and continued to the top. 



Figure 101. Location of strain gages on the 66-inch-diameter capsule for 

 external pressure hydrostatic testing program. 



Short-term strains and stresses in the large-scale capsule prototype 

 were recorded at 27 locations (Figure 101) during all the pressurization in 

 the 0-to-800-psi pressure range. Strains were also recorded at two locations 

 during the differential temperature tests. The findings, based on strain gage 

 recordings during the short-term pressurization from 0-to-500-psi pressure 

 are: 



1. The short-term strains in the acrylic plastic hull varied linearly 

 with pressure (Figure 104). The maximum principal strains on the interior 

 surface in the equatorial regions were approximately 20% higher than on 

 the exterior surface of the hull. The magnitude of the principal strains on 

 the interior surface of the equator at 500-psi short-term pressure and 68°F 



136 



