04 May 2019 5 7K Report

I performed stress relaxation test, resulting in collecting time, stress, strain. I fitted these data to a 3-decay exponential decay model strain(t)=A0+Ai*exp(-t/ti), with i=1,2,3 and got my parameters A0, Ai and ti. Thus, I calculated modulus of elasticity of the samples.

The fact that in a stress/strain graph the curve given by data of relaxation phase doesn’t coincide with the loading, does not imply with certainty that deformation is plastic, since in the long run it can recover the shape, or am I assuming it wrong?

Is it possible to determine the type of deformation maybe starting from the time constants "ti" - or eventually from other collected data?

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