*HEADING
 TEST OF SUBSTRUCTURE MATRIX INPUT
*NODE
*NODE,SYSTEM=C
*NGEN,LINE=C
*NODE,NSET=FIX
*ELEMENT,TYPE=R2D2
*ELGEN,ELSET=RIGID
*nset,nset=NBOTSUR,GENERATE
*RIGID BODY,ELSET=RIGID,REF NODE=300
*surface,type=node,NAME=BOTSUR
NBOTSUR,1.0
*surface,NAME=RIGSUR
RIGID,SPOS
*CONTACT PAIR,INTERACTION=NO_FRI,SMALL SLIDING
BOTSUR,RIGSUR
*SURFACE INTERACTION,NAME=NO_FRI
1.0,
**
**
*USER ELEMENT,TYPE=U1001,FILE=hertzcontact_3d_sub_library,OLD ELEMENT=99,STEP=1,INCREMENT=5
*ELEMENT,TYPE=U1001,ELSET=USEREL
*UEL PROPERTY,ELSET=USEREL
*BOUNDARY
 300,1,6
 201,1
*RESTART,WRITE
*STEP
*STATIC,DIRECT
 0.2 , 1.
*BOUNDARY
 1,2,2,-.4
*CONTACT PRINT ,SLAVE=BOTSUR,MASTER=RIGSUR
*CONTACT FILE,SLAVE=BOTSUR,MASTER=RIGSUR
*OUTPUT,FIELD
*CONTACT OUTPUT,VARIABLE=PRESELECT,SLAVE=BOTSUR,MASTER=RIGSUR
*NODE PRINT
U,
*END STEP