Simcenter3D Motion example demonstrating how to avoid edge contact in an Extrude-Revolve contact.
Analytical Contact, Extrude to Revolve, Avoiding Edge Contact
Analytical contacts provide a fast, efficient, and accurate way to model contact between sheet bodies created using extrusions, revolutions, and sweeps. Between the two sheet bodies there needs to be a unique normal for the contact to be detected and force properly applied. If contact occurs at the edge of the sheet body, there will no longer be a normal and hence no contact force will be generated.
This example provides a simple demonstration of this situation and a method to resolve it.
The example model is a simple bumper test rig. It is the same model used in the FAQ “Analytical Contact, Extrude to Revolve, Avoiding Line of Contact” with a few adjustments:
In the animation with Contact Force Vector, we can see that the Bumper contacts the Obstacle, the point of contact moves up the Bumper surface, and then passes through once the contact point reaches the top of the Bumper.
To avoid the contact passing through the Bumper we need to insure there is a normal once the edge is reached. Instead of having the Bumper geometry end at the edge of the arc, we need to add a small tangent arc at the ends of the Bumper profile.
The final animation shows the contact being detected as expected.