-1,200 -1,600 



STRAIN (Min./in.) 



Figure A-3. Stress-strain curves from 3.25-in. diam x 6-in. long cores. 



TEST RESULTS 



Long-Term Test at 600 Feet 



Strain Behavior . The initial strain response of the structure on 

 being lowered to 600 feet (180 m) showed an average strain of 380 

 |jin./in. in the hoop direction and 170 |jin./in. in the axial direction 

 (Ref 9). From previous work (Refs 2, 3 and 4), it was anticipated 

 that this low level of loading should not have produced any detectable 

 strain variation along the length of the cylinder section due to the 

 discontinuity of the cylinder/end-closure joint. The actual strains 

 showed this to be true . 



34 



