*HEADING
: Membrane patch test [S4]
*PREPRINT,ECHO=NO
*RESTART,WRITE
*NODE,NSET=ALL
*NSET,NSET=SIDES,GENERATE
*ELEMENT,TYPE=S4, ELSET=EALL
*ELSET,ELSET=EL3
*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
*STATIC
0.25,1.0
*BOUNDARY
10,1,2
ALL,3,5
20,1,,.24E-3
20,2,,.12E-3
30,1,,.3E-3
30,2,,.24E-3
40,1,,.06E-3
40,2,,.12E-3
*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
10,1,2
ALL,3,5
20,1,,.48E-3
20,2,,.24E-3
30,1,,.6E-3
30,2,,.48E-3
40,1,,.12E-3
40,2,,.24E-3
*END STEP
**
** Step 3: Perturbation Step
**
*STEP,PERTURBATION
*STATIC
*BOUNDARY
10,1,2
ALL,3,5
20,1,,.24E-3
20,2,,.12E-3
30,1,,.3E-3
30,2,,.24E-3
40,1,,.06E-3
40,2,,.12E-3
*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
10,1,2
ALL,3,5
20,1,,.24E-3
20,2,,.12E-3
30,1,,.3E-3
30,2,,.24E-3
40,1,,.06E-3
40,2,,.12E-3
*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,RF,PU
*END STEP