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Really basic question, how do I find the tensile modulus E11 from a set of data?

Let the data be:

stress(GPa) 0.050 0.300 0.454 0.800

strain(mm/mm) 0.002 0.0025 0.004 0.0087

I know how to find young modulus E=strain / stress

When finding E for each of the data points, I keep getting different values, so how would I go about finding E11?

Thanks for any help

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# Finding the tensile modulus E11

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