*HEADING
: CONTACT PAIR WITH DISPLACEMENT CONTROL FOR ELASTIC-PLASTIC MATERIAL, 
          HIGH INITIAL STIFFNESS, THROUGH THICKNESS ONLY BEHAVIOR, INITIAL GAP, 
          NOT ALIGNED W/ GLOBAL AXES [GK2D2N]
*SYSTEM
0.0,0.0,0.0,1.0,-1.0,0.0
1.0,1.0,0.0
*NODE,NSET=NALL
1,0.,0.
2,0.,1.
1001,-2.,0.
1002, 2.,0.
1003,-2.,1.
1004, 2.,1.
*TRANSFORM,NSET=REFNODES
1.0,-1.0,0.0,1.0,1.0,0.0
*NODE,NSET=REFNODES
9998,0.,0.
9999,0.,1.
******************************************************
*ELEMENT,TYPE=R2D2,ELSET=RIGID1
1001,1001,1002
*ELEMENT,TYPE=R2D2,ELSET=RIGID2
1002,1003,1004
*RIGID BODY,ELSET=RIGID1,REFNODE=9998
*RIGID BODY,ELSET=RIGID2,REFNODE=9999
*surface,NAME=MLOWER
RIGID1,SPOS
*surface,NAME=MUPPER
RIGID2,SNEG
*surface,type=node,NAME=TOP
2,1.0
*surface,type=node,NAME=BOTTOM
1,1.0
*CONTACT PAIR,INTERACTION=ROUGH,ADJUST=0.001,TIED
BOTTOM,MLOWER
TOP,MUPPER
*SURFACE INTERACTION,NAME=ROUGH
*******************************************************
*ELEMENT,TYPE=GK2D2N,ELSET=EINT
1,1,2
*GASKET SECTION,ELSET=EINT,BEHAVIOR=IS
,0.1
*GASKET BEHAVIOR,NAME=IS
*GASKET THICKNESS BEHAVIOR,DIRECTION=LOADING
0.,0.
20.,0.005
45.,0.05
70.,0.135
82,.22
83,.287
*GASKET THICKNESS BEHAVIOR,DIRECTION=UNLOADING
0.,0.08,0.08
14.,0.12,0.08
70.,0.135,0.08
0.,0.17,0.17
25.,0.20,0.17
82.,0.22,0.17
0.,0.23,0.23
36.,0.265,0.23
83.,0.287,0.23
*EXPANSION
1.e-2,
*******************************************
*AMPLITUDE,NAME=HIST
 0.,-.104,    1.,-.100,   2.,-.106,   3.,-.100,
 4.,-.140,    5.,-.106,   6.,-.100,   7.,-.234,
 8.,-.236,    9.,-.100,  10.,-.319,  11.,-.321,
12.,-.386,   13.,-.100,  14.,-.387,  15.,-.400
*BOUNDARY
9998,1,2
9998,6,6
9999,1,1
9999,6,6
*******************************************
*STEP,INC=10000
Test Thickness Behavior of Gasket
*STATIC
0.01,15.,,0.01
*PRINT, FREQUENCY=100
*OUTPUT, FIELD, FREQUENCY=100
*OUTPUT, HISTORY, FREQUENCY=100
*BOUNDARY,AMP=HIST
9999,2,,1.0
*NODE PRINT,FREQ=0
U,RF
*NODE FILE,FREQ=148
U, 
RF, 
*EL PRINT,FREQ=0
S, 
E, 
NE, 
EE, 
PE, 
EVOL, 
THE, 
TEMP, 
*EL FILE,FREQ=148
E, 
EE, 
NE, 
PE, 
S, 
EVOL, 
THE, 
*END STEP
*******************************************
**No Test of Membrane Behavior of Element
*******************************************
**No Test of Transverse Shear Stiffness of Element
*******************************************
*STEP
Free Thermal Expansion of Element
*STATIC
*BOUNDARY,OP=NEW
9998,1,2,0.0
9998,6,6,0.0
9999,1,1,0.0
*TEMPERATURE,OP=NEW
NALL,100.
*END STEP
*******************************************