﻿to Illustrate Elastic Hysteresis. 



527 



The two sets of results are in many ways in agreement. 

 Smith & Wedgwood found that, provided the amplitude of F 2 

 was not too great, the mean-stress-strain curve was a straight 



Fig. 7 a. 



line for values of |F ( 

 depending on |Fi|. 



and 



when 



was 



| which did not exceed certain limits 



These limits were sharply defined, 



caused to go outside these limits, a 



mean-stress-strain loop was formed. A typical diagram is 

 shown in fig. 7 b. Such a loop, which increased in size with 



