*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
*STATIC
0.25,1.0
*BOUNDARY
NALL,3,5
 1,1,2
 2,1,1,2.4E-04
 2,2,2,1.2E-04
 9,1,1,1.2E-04
 9,2,2,0.6E-04
15,1,1,0.3E-04
15,2,2,0.6E-04
18,1,1,2.7E-04
18,2,2,1.8E-04
 4,1,1,0.6E-04
 4,2,2,1.2E-04
 3,1,1,3.0E-04
 3,2,2,2.4E-04
20,1,1,1.8E-04
20,2,2,1.8E-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
**
** Step 2: General step
**
*STEP
*STATIC
0.25,1.0
*BOUNDARY
NALL,3,5
 1,1,2
 2,1,1,4.8E-04
 2,2,2,2.4E-04
 9,1,1,2.4E-04
 9,2,2,1.2E-04
15,1,1,0.6E-04
15,2,2,1.2E-04
18,1,1,5.4E-04
18,2,2,3.6E-04
 4,1,1,1.2E-04
 4,2,2,2.4E-04
 3,1,1,6.0E-04
 3,2,2,4.8E-04
20,1,1,3.6E-04
20,2,2,3.6E-04
*END STEP
**
** STEP 3: Perturbation Step
**
*STEP,PERTURBATION
*STATIC
*BOUNDARY
NALL,3,5
 1,1,2
 2,1,1,2.4E-04
 2,2,2,1.2E-04
 9,1,1,1.2E-04
 9,2,2,0.6E-04
15,1,1,0.3E-04
15,2,2,0.6E-04
18,1,1,2.7E-04
18,2,2,1.8E-04
 4,1,1,0.6E-04
 4,2,2,1.2E-04
 3,1,1,3.0E-04
 3,2,2,2.4E-04
20,1,1,1.8E-04
20,2,2,1.8E-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
**
** Step 4: Steady State Dynamics
**
*STEP
*STEADY STATE DYNAMICS,DIRECT
10.0, 
*BOUNDARY
NALL,3,5
 1,1,2
 2,1,1,2.4E-04
 2,2,2,1.2E-04
 9,1,1,1.2E-04
 9,2,2,0.6E-04
15,1,1,0.3E-04
15,2,2,0.6E-04
18,1,1,2.7E-04
18,2,2,1.8E-04
 4,1,1,0.6E-04
 4,2,2,1.2E-04
 3,1,1,3.0E-04
 3,2,2,2.4E-04
20,1,1,1.8E-04
20,2,2,1.8E-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,PU
*END STEP