Automatic contact detection will detect contact between bodies within a multibody part.

To connect multiple bodies within a part using a shared node, the bodies must share a face or an edge. If they do not, the application may not achieve appropriate contact for the analysis and the analysis could experience rigid body motion.

Removing (for example, suppressing) a body or a part from your source geometry and then refreshing and/or updating the geometry in Mechanical causes the application to remove the body or part from the tree Outline. If you subsequently return the body/part to the source and return it to Mechanical through a refresh or update, the body/part returns to default settings (Stiffness Behavior, material, etc.).