strength, based on a 0.2-percent offset, ranged from a low of 121, 000 psi 

 to a high of 132, 300 psi with an average value of about 127, 500 psi. The 

 specimens and model were loaded at twice the rate used for Models OV-3 

 and OV-4. 



INSTRUMENTATION AND TEST PROCEDURE 



To study the elastic and inelastic behavior of the structure and to 

 facilitate interpretation of the mode of failure and collapse pressure, 

 strains were nneasured on Models OV-1 and OV-2 by electrical resistance 

 strain gages. Strain-gage locations for Models OV-1 and OV-2 are shown 

 in Figures 10 and 11, respectively, together with the measured strain sen- 

 sitivities. Because of the small size of Models OV-3, OV-4, and OV-5, 

 it was not feasible to take strain measurements on these models. 



OUTSIDE 













-0.51 



1 





T 



-0.43 



1 









1 J. 1 1 1 



? 









-0.41 



1 





-0.40 



1 

















1 





II ■ 





1 





1 





IL _J 



GENERATOR 

























































1 



IT I T I 



«j-003-0^3 -QOB 



H h 



MEASURED STRAINS 



Strain senBlUvitles are given in 

 microincbeB per inch per psi of 

 pressure. 



WEB NUMBERS 



S fl ^ 

 9 ? ? 



-0.05-Q4I -10.02 

 111 





1 



GENERATOR 

 "B" 



























































1 



INSIDE 

























































? ? 



T T ' 



-0.01 -027 

 THEORETICAL STRAINS 



Figure 10 - Theoretical and Measured Strain Sensitivities for Model OV-1 



15 



