When the first part of the stress-strain curve is not linear, how can i calculate the young modulus?

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Seyed Hesam Mirfarsi

Dear Pantea Azadpur

Depending on the nature of your material, elastic behavior could be different. Also, make sure that your specimen does not have any sort of buckling, so that the initial strains are not consumed to straighten the specimen. Normally, you can measure Young modulus around 3 % strain.

Hope that helps.

Pantea Azadpur

thank you