Not sure....
You shouldn't have to change the BC's and Constraints when switching from Rotation to Moment control. How are you applying the moment? You should apply it to DOF 6 (which is rotation about axis 3). In the input file, it should look like:
*Cload
<node set>,6,<magnitude>
I believe Abaqus accounts for any forces that you apply externally, so RHS is the negative of internal forces and you don't have to worry about adding/subtracting the external forces.
Did this not work for you? Or are you just seeking information first?
The first thing I noticed in your file is that you are applying your rotation to axis 2 (UR2), but the cylinder is oriented along axis 3, so you should use UR3 to apply your rotation.
Also, you should apply a zero displacement boundary condition to your reference node in all the other DOFs...
What are the strains in your simulations? You only define material data up to a strain of (0.001 + 0.0018 = 0.0028) which is a pretty tiny strain. Does the experimental data continue to harden past this point? Or does it flatten out? If it continues to harden, they I'd recommend adding some more...
As a baseline, you just need uniaxial stress strain data, just like for any other material model. I believe the Abaqus docs outline other possible tests (biaxial, triaxial, shear, etc) as well.
Create an analytical rigid part with a reference point. Then create a surface on the part. Put the part into your assembly and tie that surface to a matching surface on the deformable cylinder.
(Sorry, can't open tars on this computer)
It depends on how many elements you have in your simulation and whether or not those three elements are in a critical region of your model. If you have 30,000 elements and only three are distorting, then you're probably okay. BUT, if those elements are near a critical region, then this could be...
Mooney-Rivlin is a hyperelastic material model. Experimental data is not based on it, but rather may be fit by a mooney-rivlin model.
Also, I'm not a bioengineer, but I doubt that mooney-rivlin is what you want to model bone.
Abaqus won't evaluate the viscoelastic part of the model when you use the CAE Evaluate button. It ignores it and just evaluates the hyperelastic portion.
It looks like your creep time constant is really really small, which is why you see the initial spike and then the flattening out. Try to...
Have you tried your model with only the hyperelastic portion of the material model in a static step? If not, you can use CAE's "evaluate" function to test that the hyperelastic constants work properly.
Also, I would start with a one element model and pull it in tension or compression at a...
First make sure your material model is okay. For a hyperelastic model, you can use the "Evaluate" function in CAE. If that runs, then your material model is probably okay and you can move on to further debugging.
There's nothing wrong with that error message. All it's telling you is that it adjusted a lot of nodes to make sure they were in contact, but it didn't print them all to your data file. It's no big deal.
You change the simulation strain rate by changing the rate of your loading in your simulation. You can look at the log strain rate contours with field variable ER. If this is several orders of magnitude higher than your tensile test, then your simulation results are meaningless. I would try to...
You could try another modeling approach. Instead of the coupling, try tieing a rigid plate to the end of your tube. Then, apply your rotation/moment to the rigid plate's reference node.
Abaqus uses radians.
What are the stresses when you apply a moment? For the case when you apply a moment, you can output the rotation and torque from the reference node to the history data by requesting TM and UR. I would then apply this rotation in your case that is rotation driven and see if...
