 
 
 
 
 
 
 
  
This is a standard gap element defined between two nodes. The clearance  of
the gap and its direction
 of
the gap and its direction 
 are defined by using the
*GAP card. Let the
displacement vector of the first node of the GAPUNI element be
 are defined by using the
*GAP card. Let the
displacement vector of the first node of the GAPUNI element be 
 and
the displacement vector of the second node
 and
the displacement vector of the second node 
 . Then, the gap
condition is defined by (Figure 69):
. Then, the gap
condition is defined by (Figure 69):
|  | (7) |