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aluminium doesnt have a definite yielding point like steel, in the force vs extension graph. Thus by convention engineers have sat down together and agreed to make 0.2% the offset. draw a line parallel to the linear proportionality obeying hookes law, make the extension intercept at 0.002 (0.2%) then see where this intersects with the graph, this will give you the yield strength of the material. materials like steel and ceramics don't require a proof stress however materials such as polymers, composites and non-ferrous metals (aluminium, copper) do.

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