1. The problem statement, all variables and given/known data Deducing what the area under the stress-strain curve shows. There are four option in the attached image. I can discount work done by considering the units. The remaining ones seem plausible, but only one is true. 2. Relevant equations stress = force / area; strain = proportional extension in length 3. The attempt at a solution stress units are N / m2 strain units are unitless The units of the area could be N / m2 but Nm / m3 units are also consistent. Work done / Volume variants seem plausible. If the line was y = mx then then area underneath would be (1/2)mx2. Here we have stress = young's modulus . strain. I would have thought the area under the line is (1/2) young's modulus . strain2. Not sure that helps.