By building a parallel line offset from the linear stress-strain line by 0.002 strain, the 0.2% offset yield strength is computed.
Because the yield strength of steel, according to ASTM, is 0.2% permanent strain (offset). This definition serves as a good "rule of thumb" for the majority of steels and typically equates to a 0.5% total strain. The predetermined amount of permanent strain is set along the strain axis of the graph, to the right of the origin, in order to determine yield strength. Figure 5 designates it as Point. Point (D) is crossed by a straight line that has the same slope as the first part of the stress-strain curve.
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