*INCLUDE, INPUT=all.msh
*INCLUDE, INPUT=fix.nam
*INCLUDE, INPUT=fix.sur
*INCLUDE, INPUT=interface.nam
*INCLUDE, INPUT=interface.sur
*MATERIAL, Name=EL
*ELASTIC
2.3E+11, 0.2
*DENSITY
1400
*SOLID SECTION, Elset=volume, Material=EL
*STEP, NLGEOM,INC = 10000
*DYNAMIC,ALPHA=0.0
5e-4,3.0
*BOUNDARY
 Nfix,1,3
*CLOAD
 Ninterface,1,0.0
 Ninterface,2,0.0
 Ninterface,3,0.0
*NODE FILE
 U
*EL FILE
 S, E
*END STEP