When rupture is modeled and elements are expected to fail, it is important to deal with
failed elements defined either as a master segment, or as slave nodes.
When an element is deleted, its corresponding segment is still taken into account and its nodes
are still considered for contact. This behavior can lead to a huge error, as deleted
elements have no stiffness; therefore, it is recommended to set the flag
Idel
to 2 when failure is expected. This flag will remove any failed element from the master
surface and corresponding nodes will be removed from the slave nodes list.
Note: The Idel flag exists as of Radioss V5.1. For older versions,
refer to /DELINT/ON.