0.6 0.9 



Distance From Penetration Edge (radians) 

 Figure 100. Stresses on the interior of a 15-inch-diameter capsule under axial 

 compression applied by internally located pretensioned tie rods. 



Large-Scale Capsule 



Because only one 66-inch-OD x 61-inch-ID large-scale capsule proto- 

 type (NEMO capsule 0) was available for the determination* of the many 

 facets of structural behavior exhibited by the acrylic plastic hull, it was much 

 more exhaustively instrumented and produced considerably more data than 

 the model capsules. This is particularly true of the strain data generated by 

 81 strain gages (Figure 101) during more than 100 pressure cycles of differ- 

 ent periods and pressure magnitudes. Since the detailed evaluation of this 

 voluminous strain data and its comparison with computer generated values 21 

 is a rather involved operation, the detailed discussion of experimental data 

 were omitted from this report to be published as a separate report at a later 

 date. 22 However, in order to make this report complete, the findings of the 

 strain and stress analysis are presented here in the form of summaries (Figures 

 102 and 103); there are also discussions of tests that did not employ strain 

 gage instrumentation systems. 



Since all the tests performed on the large-scale capsule prototype 

 were cyclic, even though of different period duration and maximum pressure 

 level, the discussion of findings will be classified by type of response or phys- 

 ical characteristic rather than by test as was done in the discussion of findings 

 for model capsules. 



The proof tests performed on the three production 66-inch NEMO capsules were very 

 limited and therefore are not discussed in the main body of the report. (See Appendix F.) 



135 



