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Engineers apply the knowledge of math & science to design and manufacture maintainable systems used to solve specific problems. AskEngineers is a forum for questions about the technologies, standards, and processes used to design & build these systems, as well as for questions about the engineering profession and its many disciplines.

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In work hardening, after unloading, there is a residual stress. How does this actually then increase the yield strength? Like doesn't it still have the same yield stress as a material that's not work hardened? Trying to understand the graph.