Block Format Keyword This interface simulates impact between nodes and external surfaces of brick. The external surfaces can be 16-node thick shell element, 20-node brick element, 8-node brick or 8-node thick shell element.

This interface uses Lagrange Multiplier kinematical conditions. These kinematical conditions are only compatible with other Lagrange Multipliers kinematical conditions. This interface formulation is not compatible with SPMD parallel version.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
grnd_IDs grbrc_IDm                


Field Contents SI Unit Example
inter_ID Interface identifier.

(Integer, maximum 10 digits)

unit_ID Unit Identifier.

(Integer, maximum 10 digits)

inter_title Interface title.

(Character, maximum 100 characters)

grnd_IDs Secondary nodes group identifier.


grbrc_IDm Main brick element identifier.


ITIED Tied option flag.
= 0
= 1
Tied - the secondary node is tied during impact with possible rebound.




  1. For brick elements (8-nodes, 20-nodes), contact is only considered on face 1-2-3-4 and 5-6-7-8.
  2. For thick shell elements (8-nodes, 16-nodes), contact only occurs on top and bottom surface (1-2-3-4 and 5-6-7-8).
  3. The defined nodes must have non-zero mass.
  4. The following kinematic conditions can be used with Lagrange Multipliers:
    • Interface TYPE16
    • Interface TYPE17
    • Interface TYPE2
    • Interface TYPE7
    • Boundary condition
    • Rigid body
    • Imposed velocity
    • Rigid wall
    • General joints
    • Multi-point constraints