topic F360 FEA simulation - inverted displacement - bug?? in Fusion Support Forum

F360 FEA simulation - inverted displacement - bug??

donzapple — Thu, 08 Oct 2020 20:02:39 GMT

This is a simple cantilever model with a vertical load applied in the upwards direction. The results always show the displacements (all load cases) as the opposite sense from the applied load.

Loads are applied as shown in the screenshots. If the load is inverted (e.g. -250N) or applied to other vertices in alternate orientations, the results always show as inverted.

Suggestions??

Donald Gibson

@highceeaerotech.com

Re: F360 FEA simulation - inverted displacement - bug??

TheCADWhisperer — Fri, 09 Oct 2020 10:55:25 GMT

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

Can you reproduce this behavior in a new file with a simple rectangular profile cantilever?

Re: F360 FEA simulation - inverted displacement - bug??

donzapple — Fri, 09 Oct 2020 18:40:02 GMT

If the load is applied to the edge vertex instead of the face of the cylinder, the displacement is correct. The bug seems to be in the translation of the force vectors in this situation.

I rearranged the loads to act on the edge vertices in the -Z direction. Previously the loads were arranged parallel to the face of the cutout, oriented 90 degrees to the -Y direction, which should relate to the same load vector.

The FEA analysis was successful with the loads applied to edge vertices.

🙂