Thank you for your reply! And I’ m sorry about my late reply.
I also have some questions
Would I interpret small strain as the part before plastic stage?
Before I do stress relaxation test about my material, I do uniaxial compression test to confirm its linear elastic stage. Because as far as I know, the stress relaxation test must ensure that it is within the linear elastic stage of material. Due to limitations, I can only apply load at a low speed (about 10mm/min to 60mm/min), I ‘m not sure how to confirm the linear elastic stage, because before 0.2 strain, the uniaxial curves don’ t seem to be completely ‘ linear‘ . I’ m not sure whether my understanding is correct. The figure shows the uniaxial compression curves. Red line = 10mm/min, Blue line = 60mm/min.
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