Solenne, I'm most familiar with the ANCF elements. The ANCF formulation supports both geometric and material non-linearities. Currently most of the ANCF elements in Chrono are formulated with only a linear viscoelastic material, but they do inherently support moderately large deformations (i.e. large angle bending, but not plastic like flows.)
Here are a few thoughts on things to try: If you've only tried to run a static analysis, you might want to try running a dynamic analysis with a slowly applied load with a relatively large amount of damping to dynamically settle to the "static" solution? If you are running a static analysis, are you running the linear static or nonlinear static analysis version? If you are using the nonlinear static analysis, what argument are you giving that function? If you haven't already examined refining your mesh (using more elements), you might want to give that a try as well. Finally, the ANCF Shell 3423 element has a relatively low order (linear) interpolation function. You could also try an element with a richer/higher order interpolation function like the "ChElementShellANCF_3833"element. Best Regards, Mike Taylor On Tuesday, December 10, 2024 at 10:26:15 AM UTC-6 SoMdt wrote: > Hello, > > I am implementing a simple test of a cylinder with fixed extremities under > pressure (length of 42 mm, radius of 2.5 mm and thickness of 0.6 mm). > Material has a Young's modulus of 0.6 MPa and nu=0.45. > I tested ShellBST, ShellReissner and ShellANCF4234 in chrono and compared > the results with Abaqus. > > With a pressure of 0.001 MPa, the results are the same as Abaqus. However, > when increasing the pressure to 0.03 MPa, the deformation of the cylinder > is roughly twice lower in chrono than in Abaqus (results are in the same > magnitude for all 3 shell elements). > > To completed the analysis, in Abaqus, when setting the NLGEOM parameter to > NO, the deformation goes down to the range of chrono deformation. > > My question then : are there shelle elements able to consider large > deformations ? Did I forget a hidden parameter somewhere ? > > Thanks a lot for you help, > Solenne > -- You received this message because you are subscribed to the Google Groups "ProjectChrono" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/projectchrono/0f1bf0ab-9c12-4e37-8564-7d10a11d950dn%40googlegroups.com.
