Learning Forum

[mahdi97ibrahim]

After Obtaining my natural frequencies under modal analysis and after inserting the modal shapes, I found some penetration and clash of parts after simulation so what should I do to prevent the simulation from doing that?

[peteroznewman]

You can't prevent surfaces from passing through each other in Modal if they were separated initially. All you can do is turn down the display scale so they don't appear to move as much as they do with the default display displacement scale factor.

Note that the displacement values in Modal do not represent actual displacements in a real load condition because there are no loads in Modal.

If you want to know if those surfaces will touch in a real load condition, you can simulate that in Harmonic Response.

If that predicts that the parts will touch, then you can add a Transient Structural analysis and add Frictional Contact between those faces and they will collide in the simulation and not pass through each other.

[mahdi97ibrahim]

I try the same model on static structural analysis with frictionless contact between these two parts however surfaces pass through each other

so what shall I do in order to prevent that ?

[peteroznewman]

Insert a Contact Tool under the Connections folder. Check initial contact status. Is the Contact Near Open or Far Open?

If the contact is Far Open, then go to the contact definition and type in a Pinball Radius that touches the other body.

If the contact is Near Open, then you have to take smaller time steps or more substeps.

[mahdi97ibrahim]

My case was near open so I take smaller time steps with more substeps also , but the 2 elements still pass each other 

what shell I do ?