Hi!
I'm a quite unexperienced ABAQUS-user and would be pleased if somebody could help me.
At the moment I'm trying to modell a composite tube fixed together (rigid connection) with an isotropic material tube under axial torsional load. I have been modelling this with shell elements and also with solid elements. For modelling the composite tube with solid elements it is necessary to have a local coordinate system specified, what I did with specifying a cylindrical coordsystem. So my problem is, that the results of the shell modell and the solid modell differ more the 100%.... The shell model is far more stiffer than the solid modell. I checked already the element size (1:2), and used quadratic elements (which is a total overkill actually), and I also tried all possibilities (even if they do not make sense) for the local cylindrical coordsystem, which I defined with coordinates.
So If anybody has an idea, where the problem could be, please give me a sign
To understand the local coordsys better I have been modelling a plate under torsional load, and here everything worked out reasonably and even fit with the shell modell results!