During Explicit Dynamics analyses, highly distorted elements may be automatically removed (eroded) from the model. As elements erode, nodes may become free (not connected to any element). These nodes have mass and inertia and can impact other structures. By default, eroded nodes are plotted as red dots (see below).

The Eroded Nodes toggle found in the Show drop-down menu in the Display tab allows you to remove the eroded nodes from the display, as shown below.