*HEADING
: DIRECT ENFORCEMENT WITH LOAD CONTROL FOR ELASTIC MATERIAL
          WITH DAMAGE, INITIAL GAP [GKAX4]
*NODE,NSET=NALL
*ELEMENT,TYPE=GKAX4,ELSET=EINT
*GASKET SECTION,ELSET=EINT,BEHAVIOR=IS
*GASKET BEHAVIOR,NAME=IS
*GASKET ELASTICITY,COMPONENT=MEMBRANE
*GASKET ELASTICITY,COMPONENT=TRANSVERSE SHEAR
*GASKET THICKNESS  BEHAVIOR,DIRECTION=LOADING,TYPE=DAMAGE
*GASKET THICKNESS BEHAVIOR,DIRECTION=UNLOADING,TYPE=DAMAGE
*EXPANSION
1.e-2,
*******************************************
*AMPLITUDE,NAME=HIST
0.0,0.0, 1.0,-20., 2.0,-35., 3.0,-0.1,
4.0,-35., 5.0,-50., 6.0,-0.1, 7.0,-50.,
8.0,-65., 9.0,-0.1, 10.0,-65., 11.0,-80.,
12.0,-0.1, 13.0,-80., 14.0,-95., 15.0,-0.1,
16.0,-95., 17.0,-110., 18.0,-0.1, 19.0,-110.,
20.0,-125., 21.0,-0.1, 22.0,-125., 23.0,-140.,
24.0,-0.1, 25.0,-140., 26.0,-155., 27.0,-0.1,
28.0,-155., 29.0,-170., 30.0,-0.1
*BOUNDARY
1,1,2
2,1,2
*******************************************
*STEP,INC=10000,NLGEOM
Test Normal Behavior of Gasket
*STATIC
.01,20.,,0.01
*CLOAD,AMP=HIST
3,2,10.47236
4,2,11.51936
*NODE PRINT,FREQ=0
U,RF
*NODE FILE,FREQ=148
U,
RF,
*EL PRINT,FREQ=0
S,
E,
NE,
EE,
EVOL,
THE,
TEMP,
*EL FILE,FREQ=148
E,
EE,
NE,
S,
EVOL,
THE,
*OUTPUT,FIELD,FREQ=148,VAR=PRESELECT
*END STEP
*******************************************
*STEP
Test Membrane Behavior of Element
*STATIC
*BOUNDARY,OP=NEW
1,1,2,0.0
2,2,2,0.0
3,1,2,0.0
4,2,2,0.0
*CLOAD,OP=NEW
2,1,-50.0
4,1,-50.0
*END STEP
*******************************************
*STEP
Test Transverse Shear Stiffness of Element
*STATIC
*BOUNDARY,OP=NEW
1,1,2,0.0
3,2,2,0.0
2,1,2,0.0
4,2,2,0.0
*CLOAD,OP=NEW
3,1,-4.0608
4,1,-7.2936
*END STEP
*******************************************
*STEP
Thermal Expansion of Element
*STATIC
*BOUNDARY,OP=NEW
1,2
2,2
*CLOAD,OP=NEW
*TEMPERATURE,OP=NEW
NALL,100.
*END STEP
*******************************************