Actually I defined the normal stiffness as secant and the shear one as
tangent. This because I was following PFC manual. But I see it is
better to get both stiffnesses as tangent (I will modify it). So once
I do that I can just pass those values to the GST, right?
GST will read kn/ks automaticaly. But be carefull, I'm not sure tangent
stiffness is the best way for computing the force itself, it introduces
approximations. The best would be to use an exact relation fn(un) for
the force, like in PFC, and define the derivatives (and call them
"kn/ks") for use in GST.
Bruno
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