*HEADING
: PERTURBATION ANALYSIS/MULTIPLE LOAD CASES FOR ELASTIC_PLASTIC MATERIAL WITH LOW
          INITIAL STIFFNESS, THICKNESS DIRECTION BEHAVIOR ONLY [GK2D2N]
*NODE,NSET=NALL
*ELEMENT,TYPE=GK2D2N,ELSET=EINT
*GASKET SECTION,ELSET=EINT,BEHAVIOR=IS
*GASKET BEHAVIOR,NAME=IS
*GASKET THICKNESS BEHAVIOR,DIRECTION=LOADING,VARIABLE=FORCE
*GASKET THICKNESS BEHAVIOR,DIRECTION=UNLOADING,VARIABLE=FORCE
*GASKET CONTACT AREA
*BOUNDARY
1,1
*STEP,NLGEOM,PERTURBATION
*STATIC
*CLOAD
2,1,-0.010298
*EL PRINT,FREQ=0
S,
CS11,
E,
EE,
*EL FILE,FREQ=18
S,
CS11,
E,
EE,
*OUTPUT,FIELD,FREQ=18,VAR=PRE
*END STEP
*STEP,NLGEOM
*STATIC
*CLOAD
2,1,-46.43
*NODE PRINT
U,
RF,
*EL PRINT,FREQ=0
S,
CS11,
E,
EE,
PE,
EVOL,
*EL FILE,FREQ=18
S,
CS11,
E,
PE,
EVOL,
*END STEP
*STEP,NLGEOM,PERTURBATION
*STATIC
*CLOAD
2,1,-94.
*EL PRINT,FREQ=0
S,
CS11,
E,
EE,
*EL FILE,FREQ=18
S,
CS11,
E,
EE,
*END STEP
*STEP,NLGEOM
*STATIC
*CLOAD
2,1,-14.
*NODE PRINT,FREQ=0
U,
RF,
*EL PRINT,FREQ=0
S,
CS11,
E,
EE,
PE,
EVOL,
*NODE FILE,FREQ=18
U,
RF,
*EL FILE,FREQ=18
S,
CS11,
E,
PE,
EVOL,
*END STEP
*STEP,NLGEOM,PERTURBATION
*STATIC
*CLOAD
2,1,-94.
*EL PRINT,FREQ=0
S,
CS11,
E,
EE,
*EL FILE,FREQ=18
S,
CS11,
E,
EE,
*END STEP
*STEP,NLGEOM,PERTURBATION
*STATIC
*LOAD CASE,NAME=PRESSURE-1
*CLOAD
2,1,-94.
*END LOAD CASE
*LOAD CASE,NAME=PRESSURE-2
*CLOAD
2,1,-150
*END LOAD CASE
*EL PRINT,FREQ=0
S,
CS11,
E,
EE,
*OUTPUT,FIELD
*ELEMENT OUTPUT
S,
E,
EE
*END STEP