Block Format Keyword This interface simulates impact between external surfaces of two brick groups. The external surfaces can only be 16-node thick shell (/SHEL16) elements.

A Hertz contact theory is used in this interface. This interface does not use Lagrange multiplier kinematical conditions and is compatible with all kinematic conditions. The formulation is like a penalty formulation; but with a physical penalty stiffness based on Hertz contact theory.

Figure 1.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
grbrc_ID1 grbrc_ID2                


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)

grbrc_ID1 First brick group identifier (16-node thick shells group)


grbrc_ID2 Second brick group identifier (16-node thick shells group)


Fric Coulomb friction




  1. Both surfaces are defined with two brick IDs and not surface IDs.