Define the CONTA/TARGE pair

TYPE, REAL, KEYOPT, and ESURF on the top and bottom faces.

Step 2 — Define the CONTA/TARGE pair

ET,2,CONTA174
KEYOPT,2,12,0
ET,3,TARGE170
TYPE,3 / REAL,2 / MAT,1
ASEL,S,LOC,Y,h_lower
NSLA,S,1 / ESLN,S / ESURF
TYPE,2 / REAL,2 / MAT,1
ASEL,S,LOC,Y,h_lower+initial_gap
NSLA,S,1 / ESLN,S / ESURF

Confirm that n_conta and n_targe are > 0 before continuing.

CONTA174 and TARGE170 elements at the interface after ESURF — Figure 3. Contact and target elements created with `ESURF` on the selected faces.

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