PLASTIC FAILURE OV CYLINDRICAL SHELLS. 



637 

 21 



welds connecting the stiffening rings to it failed. Those failures, however, 

 did not appear to affect the load-carrying capacity of the cylinder to any 

 significant extent. The overall shortening of the cylinder was greater 

 than in the earlier tests and Fig. 34 shows its amount at various stages. 

 The maximum shortening was about 0-3 inch instead of 0-2 inch obtained 

 in Test No. IB. The contours of the damaged surface are shown in Fig. 35 

 and the appearance of the dent at (a) in Figs 36 (facing p. 17). 



The absence of end plates allowed the cylinder to flatten and the end 



Figa 31. 



Fig. 33. 



Q 6.000 



< 



o 



i.OOO 



oTT 



tr 



ram displacement , inches 



Load-Displacement Curve for 

 Cyundeb No. 2. 



Contours and Section op Dent m 

 Cyltnder No. 1 after Test B. 



sections at the conclusion of the test were ovals having major and minor 

 axes of 17 inches and 16 inches respectively instead of circles of 16J inches 

 diameter. In view of that distortion a second test on the cylinder would 

 have been of no value. The distortion affects the absolute accuracy of 

 the contours which, as mentioned previously, were based upon the final 

 end plates as datum lines. For obtaining the shape of the sections of the 

 dent along the axis of the cylinder they are reliable ; in the case of circum- 

 ferential sections, however, slight distortion is produced. 



Test No. 3 was made on a complete cylinder under the same conditions 

 as Test No. IB, that is to say, with the load applied mid-way between two 

 rings. In that test the load was steadily increased to the maximum value 

 that it would sustain, there being no removal and re-application of loads 



