I'll 



Prof. Carii8-\YiU n. 



true stress strain curve OC for the steel of which the bar is com- 

 posed (fig. 3). m We may refer to the same axes the curve 

 showing the increase in the resistance to rupture with elongatu 

 per unit of length and when AB cuts the curve OC the 

 must break, i.e., when the stress per unit of area of transver 

 section becomes greater than the breaking stress corresponding to 

 that degree of elongation. If the two carves do not meet, the bar 

 will continue to draw out as is the case with lead. 



The method that is ordinarily adopted for estimating the tent 



