*HEADING
: Membrane patch test [S4]
*PREPRINT,ECHO=NO
*NODE,NSET=ALL
10,0,0
20,.24,0.
30,.24,.12
40,0.,.12
102,.04,.02
104,.18,.03
204,.16,.08
202,.08,.08
*NSET,NSET=SIDES,GENERATE
10,40,10
*ELEMENT,TYPE=S4, ELSET=EALL
1,10,20,104,102
2,10,102,202,40
3,102,104,204,202
4,104,20,30,204
5,202,204,30,40
*ELSET,ELSET=EL3
3,
*SHELL SECTION,MATERIAL=A1, ELSET=EALL
0.0125,5
*MATERIAL,NAME=A1
*ELASTIC,TYPE=ISOTROPIC
1.E6,.25
*DENSITY
1.0, 
**
** Step 1: General Step
**
*STEP,NLGEOM
*STATIC
0.25,1.0
*BOUNDARY
10,1,2
ALL,3,5
20,1,,.96E-3
20,2,,.48E-3
30,1,,1.2E-3
30,2,,.96E-3
40,1,,.24E-3
40,2,,.48E-3
*EL FILE,ELSET=EL3,POS=NODES,FREQ=999
S, 
E, 
*EL PRINT,FREQ=999
S, 
E, 
*NODE PRINT,FREQ=999
U, 
RF, 
*NODE FILE,FREQ=2
U, 
*END STEP