21 September 2018
- Last edited 21 September 2018
FEA models are idealizations of physical systems. For beam bending problems, the freedom of the end of the beam is what is important. On a solid model, a fixed straight edge provides a pinned connection to ground. If you hold the circular edge fixed, that is the same as holding the face fixed and you no longer have a pinned end, you have a fixed end and a very different displacement solution.
If you leave AIM and use Mechanical, you have more tools available such as Remote Displacement. With remote displacement, a point is created at the center of the face, connected to the face, and you specify how you want to hold the point. You can hold three translations, and it becomes a spherical joint, You can hold one translation and it becomes a roller support, you would hold three translations and two rotations and it becomes a pinned connection to ground. The point can be located a the center of the face.
Don't worry about whether the support is located at the bottom of the rod or the center of the rod, the deformation and stress are going to be identical for the small deflections of a beam.