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Re: [Question #256287]: Time Stepper for a new material model

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Chareyre <question256287@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 28 Oct 2014 17:06:51 -0000
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Question #256287 on Yade changed:
https://answers.launchpad.net/yade/+question/256287

Chareyre proposed the following answer:
Hi Ricardo,
It will work if GSTS can find relevant values for kn, ks, cn and cs.
An approach is to keep them updated to reflect the tangent values of
stiffness/viscosity: dF/du and dF/dv (u: disp., v: velocity).
For instance, if your law reads: fn = E*un^2, you would define
phys->kn=2*E*un so that GSTS can use it.

I can see a regression in HertzMindlin on this aspect since, some time
ago, it was defining kn and ks in this way for the sole purpose of
getting results in GSTS.
Currently they are not defined (hence kn=ks=0).

Bruno

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