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[Václav Šmilauer <eudoxos@xxxxxxxx>]

> in tests on 2 particle, there is not any problem, it is OK.
> I run Uniaxial strain test, in this test there is problem.
Try with Law2_Dem3DofGeom_FrictPhys_Basic, that will show you if the
problem is in your law (which I suppose) or elsewhere. 

Try also to go down with strain rate (10x or 100x at least). You might
be just ripping off the support in tension due to inertial forces, for
instance, while you compress the whole bulk.

HTH, v.