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How to understand the meaning of CohesionMoment.shear_creep in CohesiveFrictionalMaterial?

Asked by vincentw

Hi there,

Regarding cohesiveFrictional material.
I see in https://answers.launchpad.net/yade/+question/680927, you kindly mention the CohesionMoment.shear_creep as a way to add the viscous damping.
And I searched in the document, it says that this function activates creep on the shear force. Can I understand creep as damping? Could you provide certain references on creep?

Thanks!

Vincent

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Bruno Chareyre (bruno-chareyre) said : 		#1

Hi,

Creep implements a force relaxation like this:
d(fs)/dt=-fs/c

where "c" is the creeping viscosity. It is _not_ the usual spring-dashpot, which would converge to an equilibrium ultimately.
With creep activated the contacts will slide (in principle very slowly) forever.
I wouldn't dare calling it "damping" although that's a sufficiently vague notion to include nearly everything.

The law functor which is the closest to the classical spring-dashpot is Law2_ScGeom_ViscElPhys_Basic.

I hope it helps.

Bruno

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