*HEADING
: Membrane patch test [S8R]
*PREPRINT,ECHO=NO
*RESTART,WRITE
*NODE,NSET=NALL
  1,   0.,    0.
  2, 0.24,    0.
  3, 0.24,  0.12
  4,   0.,  0.12
  5, 0.04,  0.02
  6, 0.18,  0.03
  7, 0.08,  0.08
  8, 0.16,  0.08
  9, 0.12,   0.0
 10, 0.21, 0.015
 11, 0.11, 0.025
 12, 0.02,  0.01
 13, 0.06,  0.05
 14, 0.04,   0.1
 15,  0.0,  0.06
 16, 0.17, 0.055
 17, 0.12,  0.08
 18, 0.24,  0.06
 19,  0.2,   0.1
 20, 0.12,  0.12
**
**
*ELEMENT, TYPE=S8R, ELSET=EALL
  1,  1, 2, 6, 5,  9, 10, 11, 12
  2,  1, 5, 7, 4, 12, 13, 14, 15
  3,  5, 6, 8, 7, 11, 16, 17, 13
  4,  6, 2, 3, 8, 10, 18, 19, 16
  5,  7, 8, 3, 4, 17, 19, 20, 14
*ELSET,ELSET=EL3
 3, 
*SHELL SECTION,MATERIAL=A1,ELSET=EALL
0.0125,5
*MATERIAL,NAME=A1
*ELASTIC,TYPE=ISOTROPIC
1.0E6,0.25
*DENSITY
1.0, 
**
** STEP 1: General step
**
*STEP,NLGEOM
*STATIC
0.25,1.0
*BOUNDARY
NALL,3,5
 1,1,2
 2,1,1,9.6E-04
 2,2,2,4.8E-04
 9,1,1,4.8E-04
 9,2,2,2.4E-04
15,1,1,1.2E-04
15,2,2,2.4E-04
18,1,1,10.8E-04
18,2,2,7.2E-04
 4,1,1,2.4E-04
 4,2,2,4.8E-04
 3,1,1,12.0E-04
 3,2,2,9.6E-04
20,1,1,7.2E-04
20,2,2,7.2E-04
*EL FILE,ELSET=EL3,POS=NODES,FREQ=999
S,E
*EL PRINT,ELSET=EL3,FREQ=999
S, 
E, 
*NODE PRINT,FREQ=999
U,
RF,
*NODE FILE,FREQ=2
U,
*END STEP