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True stress-strain curve always lies above the engineering stress-strain curve.

True stress-strain curve always lies above the engineering stress-strain curve. Correct Answer True

True stress calculation considers the instantaneous area of the specimen in the calculation, whereas engineering stress considers the initial area of the specimen in the calculation. So, as the area is continuously reducing at constant load, the value of true stress keeps on increasing with respect to engineering stress.

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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.
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