Reinhard

In the meantime, I was playing a bit with examples from the [MFrontGallery](https://github.com/thelfer/MFrontGallery). Especially the `SignoriniHyperviscoelasticity` model seems to be very useful for my purposes. It worked without any issues,...

It is about torsion of a bar with rectangular cross section and one rbe3 element at each end. See the attached files (using the MooneyRivlin model):  [solid.zip](https://github.com/thelfer/MFrontGenericInterfaceSupport/files/15209418/solid.zip)

OK, I think that I completely misunderstood the meaning of `g`. I thought, that it is something like the `ViscoelasticShearModulus` in the `GeneralizedMaxwell` model. But now I saw that it's...

Based on a finite difference approximation of the Jacobian, I can confirm that the tangent operator of the `SignoriniHyperviscoelasticity` model should be correct. I can also confirm, that the results...

Dear Thomas Helfer, I would like to inform you, that the new mfront interface was merged into the main branch of MBDyn. So, I think that you could add [https://www.mbdyn.org/](https://www.mbdyn.org/)...