914 



Mr. W. A. Scoble : Further Tests of 

 The Results Considered. 



It is evident that the stress difference or shear stress law 

 does not apply to brittle materials. The maximum principal 

 stress is approximately constant, but as the results have been 

 set down in the order in which the tests were made, it is not 

 easy to determine whether the value o£ this stress at fracture 

 depends on the least principal stress, P 3 . 



The bending and twisting moments at fracture have been 

 plotted in fig. 3. The number of the bar tested is given 



Fiff. 3. 





1 

















> 



C4L 













Hardened Cast 

 Steel 



Bending ^Twisting 

 Moments 



5000 









3Lx\ 













\ xe 



SC 





f6C""^ 













Or 



cue 









"4LX\ 



\ 











5000 













\ 







\ 











\ 





\ 







\ 



.20 



200C 









\ 





\ 









i 









\ 



X6C 





L_ 









1000 















t 









































» -^ 



ui Hk 



IH 





.«/" 



c 



) 



10 



00 



10 



oo KnQ 



3000 91 



* 4C 



W 



* 50 



Bending Moment 



LBS. INS. 



against a point, and the leiter indicates whether the result 

 was probably high, correct, or low, and corresponds to the 

 remark in the table. If the maximum principal stress were 

 constant at rupture, the points for a bar would lie on an 



