When you only measure the cross-sectional area at the beginning of the test, and you use that value for all your stress calculations, you are calculating what is called “engineering stress.” The reason for this is that we were interested in engineering stress and not true stress. As we pulled the specimen apart, its cross-section changed, but we didn’t take any additional measurements. When we performed the tensile test in the last video, we only measured the test specimen cross-sectional area one time. Let’s look at the difference between engineering stress and true stress.
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