









CASE INOPERATIVE 

 AFTER 3R0 RUN 





/ 



/ 





J 



/LONGITUDINAL 

 / OUTER SHELL 



A 













/ 



7^ 





/ 



f 







i 









(/ CIRCUMFERENTIAL 

 / OUTER SHELL 



// 









-1000 -2000 -3000 -4000 -1000 -2000 -3000 -4000 

 STRAIN, /l IN/ IN STRAIN, /i. IN /IN 







/ 



■^ 



•"OFF 



SCALE 





/ 



/ 











// 











/ 



/ 





LONGITUDINAL 



INNER SHELL 



// 













-1000 -2000 -3000 -4000 -SOOO -6000 

 STRAIN, /I IN/IN 



-1000 -2000 -3000 -4000 -5000 -6000 -7000 -8000 

 STRAIN, /i. IN/IN 



Figure 14 - Strain Plots of Gages Located at 

 Station 1 Oy on Model OV-1 



and 9750 psi (assuming a yield strength of 120, 000 psi) for Models OV-1 

 and OV-2, respectively. Unfortunately, the stresses in these locations 

 could not be measured experimentally so as to provide a check on' the 

 computed values. This verification, however, could be and was done for 

 the accessible regions of the outer and inner shells. For comparison pur- 

 poses. Table 1 gives the experimental and theoretical Hencky-Von Mises 

 stress ratios between adjacent webs for both shells. Also given in that 

 table are the stress ratios for three other web-stiffened sandwich models 

 recently tested at the Model Basin. ^ In general, the midbay stresses 

 determined by the theory of Reference 3 are in good agreement with the 

 observed stresses except for the outer shell of Model OV-1, where the 

 prediction was 35 percent below measurement. It should be noted, how- 

 ever, that this value was based on strains mieasured at only one location. 



19 



