Offsetting Data Though Curve Fitting
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If I have a matrix of stress and strain values, how would I shift (add an offset value to) the strain data so that at strain=0 stress=preload. I have different samples of data but I'm not sure how to write a function that would add the offset value. It was suggested that we might use curve fitting or interpolation of multiple samples and then fzero but I'm still confused.
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Matt J
2023-10-13
If the stress-strain data is all linear elastic (or if you can extract a portion that is), then you could use polyfit:
p=polyfit(strain, stress,1);
youngsModulus=p(1);
offset=p(2);
stress=stress-offset+preload;
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