![]() ![]() At any load, the true stress is the load divided by the cross-sectional area at that instant. While you are pulling, the length increases, but the width and thickness shrink. At any load, the engineering stress is the load divided by this initial cross-sectional area. ![]() It’s easy to measure these, since it is your starting material. But what cross section are you considering? Before starting that pull, the bar had a known cross-section of, let’s say, 0.5″ wide x metal thickness. Load divided by cross-sectional area is force, or stress. ![]()
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