How to build the stress strain curve from displacement?

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I am very much new in matlab, how to find the stress strain curve from displacement? i have the big data from Digital Image Correlation (DIC) software.
please give some idea how to start. thanks in advance.
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dpb
dpb on 15 Dec 2018
We, of course, have no idea what data would be included in "the big data from Digital Image Correlation (DIC) software." nor in what form that might be even if we knew what comprised it.
Also, depends upon what the experiment actually was and how seriously you want estimates to be as far as compensation for area reduction with length if tensile test, incorporation of any bending moment introduced, etc., etc., etc., ...

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