ON STRESS DISTRIBUTION IN ENGINEERING MATERIALS. 



483 



that it' there is appreciable yield betore fracture it is to be expected that 

 the stress on a S''ction of a tension or compression specimen is equalised, 

 and that tht; mean maximum stress is not appreciably afEected by a pro- 

 bable amount of eccentricity in the loading. 



The test results are tabulated below, according to the material, to 

 compare the stresses at the elastic-limit, yield-point, and maximum load. 

 The elastic-limit stress, calculated by dividing the load by the area of the 

 cross-section, is also corrected in the ratio of the maximum to the mean 

 strain. 



In order to judge whether the stresses should be corrected in the ratio 

 of the variation of strain, the values at the elastic limit for the same mate- 

 rial can be compared amongst themselves, and with the yield point stresses. 



The adjustment is not justified for unannealed mild steel. In the case 

 of S2. 2 the elastic-limit and yield-point coincided. The correction makes 

 the elastic-limit greater than the maximum stress. For Sc. 5 and HP. 28 



