214 



MR ANGUS R. FULTON ON 



If T and C are equal, the final position of the neutral axis will divide each section 

 of the beam into two equal areas and the value of the fibre stress 



t or c = . . . . . ( 1 ) 



In such a case, if the section is symmetrical about the original neutral axis, the 

 position of the latter does not change. 



Experiments. 

 In order to verify the correctness of such a formula, some tests were made by 

 the author on wrought-iron bars. These bars were stressed as beams, and since the 



D 



G 



H 



Eigrl£ 



material used here was ductile, no definite rupture took place. The ultimate load 

 was therefore taken as that load at which the beam failed to stand up to the 

 applied load and buckled up. Portions were cut out and tested to failure in 

 direct tension. No tests, however, were made in direct compression, the fracture 

 value of the material under compression being assumed to be equal to that under 

 tension. 



The bars were of various sections, and are illustrated in fig. la. 

 The sections A and B, which are circular, one solid and the other hollow, show 

 an entire agreement between the direct tensile stress and the induced tensile stress. 



