I am running something called cell periodicity study in comsol, which finds the material properties of a model. It is done by applying a uniaxial compression load, and performing a nonlinear buckling analysis - this gives the stress strain curve you see below. You can think of the material being for example epoxy, and I asked colleague how we define the stiffness, and was told it is when the material stiffness becomes 30% of the initial one, and they told me it has nothing to do with strain??

So how can I tell when the material has lost 70% of its stiffness? Especially when it has nothing to do with strain.

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  • $\begingroup$ Why not ask your colleague? He/she knows what he/she meant. We can only guess. The idea of "stiffness that has nothing to do with strain" makes no sense at all to me. $\endgroup$
    – alephzero
    Jul 9 at 12:04
  • $\begingroup$ They told me something along the lines of "Buckling strength is determined by structural stiffness not strain. As a result, you will know the buckling strain aswell" $\endgroup$ Jul 10 at 4:33
  • $\begingroup$ How do you define the stiffness in your case? Usually while dealing with buckling it is more common to talk about stability, not about strength or stiffness. $\endgroup$ Jul 10 at 6:26

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