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### Two-node unidirectional gap element (GAPUNI)

This is a standard gap element defined between two nodes. The clearance 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 and the displacement vector of the second node . Then, the gap condition is defined by (Figure 40):

| (7)

Figure 40: Definition of a GAPUNI element