Discussion
Some steels do not show yield plateau and show continuous curve. For such steel, how is the yield strength obtained?
Answer: B
The yield strength is found by drawing 0.2% offset of the strain.
For steels such as high-strength and cold-worked bars that show no sharp yield point, a line is drawn parallel to the initial straight part of the stress-strain curve, starting at 0.002 (0.2 percent) strain. The stress where it cuts the curve is the 0.2 percent proof stress, taken as the yield strength.
0.5 percent is not the standard offset, and initial tangent or secant moduli describe stiffness, not yield.
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