Hi, I am trying to model a torsion moment applied onto a shaft. A common practice in a commercial FE- Solver would be to define a single node with 6 dofs lying on the axis of the shaft. Then connect this node via rigid body elements with the nodes lying on the cross-section of the shaft where the torsion moment is to be introduced. Finally, constrain 5 dofs of the previously defined single node and apply the torsion moment as a neumann condition on its 6th rotational dof.
In order to transfer this technique to getfem I thought to define a fixed size variable of size 6 to represent the single node and add constraints between this variable and the shafts dofs lying on the considered cross-section to represent the so called "rigid body elements". Though, I realized that the constraint brick can be defined only on a single variable, so it is not possible to use it in order to interconnect dofs from two different variables. I wonder if it is a good idea to extend the constraint brick in a way that it can accept two variables or if there is a simpler technique to solve my problem. Does it make sense to introduce some kind of "rigid body elements" into getfem based on such an extended two variables constraint brick? Kostas _______________________________________________ Getfem-users mailing list [email protected] https://mail.gna.org/listinfo/getfem-users
