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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> Well, I have to disagree here. I think we need first to clearly define
> our equation, is it a linear or non linear one?

It doesn't matter. If it is non-linear, you can linearize it by looking
at tangent stiffness. So, in the end the small oscillations that can
result in numerical instabilities are always ruled by something linear,
like:

$$a\ddot{X}+b\dot{X}+X=0$$


We used this approach successfully for JF Jerier non-linear law (without
viscosity).

Bruno