Reinhard

OK, the order of the tensor components and also the "load" function which I was using should be correct. Thank you! But now I just saw, that the material parameters...

Well, it would be nice to have an additional tangent operator, as I mentioned before. I think that such an option already exists, but it seems that it is not...

It seems that the First Piola Kirchhoff Stress Tensor `PK1` is returned in a transposed format. Instead of `T=(t11, t22, t33, t12, t21, t13, t31, t23, t32)` I got `T=(t11,...

Well, the difference may not be that obvious. I'm using a test case which was proposed by Konstantin Sedlan in 2000. I is about torsion tension coupling of an incompressible...

See also page 102 of the following document: [DissertationKonstantinSedlan.pdf](https://kobra.uni-kassel.de/themes/Mirage2/scripts/mozilla-pdf.js/web/viewer.html?file=/bitstream/handle/123456789/2007110219579/DissertationKonstantinSedlan.pdf?sequence=3&isAllowed=y#pagemode=thumbs)

OK, I used the formulas from this book: Richard Schwertassek Oskar Wallrapp Dynamik flexibler Mehrkörpersysteme Methoden der Mechanik zum rechnergestützten Entwurf und zur Analyse mechatronischer Systeme Friedr. Vieweg & Sohn...

Probably you are right. Maybe it would be a good idea to add a comment in the source code or documentation (e.g. in the class `FiniteStrainBehaviourOptions`).

OK, now it is clear. Thank you very much for your support. My next step would be, to include a few MFront behaviors in my testsuite and to update the...

Please have a look at the following sections of the attached draft version of MBDyn's manual and let me know if you have any suggestions! - 2.10.36 MFront code generator...

Well, MBDyn's constitutive laws and solid elements are based on templates with a fixed number of components of the stress/strain tensor (e.g. 6D for Green Lagrange Strain/Second Piola Kirchhoff Stress...