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Viscoelasticity analysis question

  1. Oct 12, 2011 #1
    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)
    ds/dt = -E(1/n)*s s = stress

    if its not a modulus, then how would I obtain the modulus?
  2. jcsd
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