PLASTIC FAILURE OF CYLINDRICAL SHELLS. 



627 



13 



different weights were dropped upon them from a height of 23 feet. Each 

 specimen was subjected to one impact only and the results are given in 

 Table I. A typical specimen after test is shown at (c) in Fig. 2. 



In that series of tests the depth of the dent and the length of groove 



d h 



were measured in each case and the corresponding values of - and 



2a 



(p. 4, ante) are plotted in Figs 20. 



Figs 20. 



(o) Coffee tin 



[b) Milk tin 



" Static test 

 ♦ Dynamic test 

 — - Ta ylor's theoretical curfe 



® Static test 

 ♦ Dynamrc test 



Tayl or's theoretical curve _ 



ol ol 06 J 08 To n T-t 

 COMPAKISON OF TeST RESULTS WITH TaYLOB's CuBVE. 



The results from the static tests previously described are shown plotted 

 in the same figures and for comparison the theoretical curve connecting 

 these parameters is also shown. The closeness of agreement between the 

 experimental and theoretical results is remarkable and justifies the 

 acceptance of Taylor's theory of the form of distortion which occurs. 



Fig. 21. 



Comparison op Test Results with Taylob's Cubve. 



Although Taylor's hypothesis is not strictly applicable to the case 

 previously described in which the load was distributed along a line, it is 

 interesting to note the close agreement between the test figures and his 

 theoretical curve as shown in Fxg. 21. 



