7.7.1 Offset Method—To determine the yield strength by the offset method, it is necessary to secure data (autographic or numerical) from which a stress-strain diagram may be drawn. Then on the stress-strain diagram (Fig. 21) lay off Om equal to the specified value of the offset, draw mn parallel to OA, and
thus locate r, the intersection of mn with the stress-strain diagram (Note 32). In reporting values of yield strength obtained by this method, the specified value of offset used should be stated in parentheses after the term yield strength, as follows: