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direct stress is based on the value obtained by dividing the load by originalcross-sectional area. That is the reason why the value of stress started dropping after neck is formedin mild steel (or any ductile material).But actually as material is stressed itscross-sectional area changes. We should divide load by the actual cross-sectional area to get truestress in the material. To distinguish between the two values we introduce the terms nominal stress and true stress

True Stress =Load/ActualCross-sectionalArea

Nominal Stress =Load/Original Cross-sectionalArea

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Q: What is nominal stress?
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