Let's say I have a maxwell body, with a behavior of exponential decay in stress relaxation test. Let's say that that a graph obtained from multiple tests of high molecular polyethleyne. my question is if I took this graph and drew a tangent line (derivative) about a point what will this represent? I thought about it, and I think its either the modulus or the dashpot viscosity. based on the formula derivation stress = Ke^((-E/n)t) where ds/dt = -E(1/n)*s s = stress if its not a modulus, then how would I obtain the modulus?