From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements: P. The engineering stress-strain curves in tension and compression are identical. Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect. R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve. S. The true stress-true strain curve in tension and compression are identical.

Answer: Option B