*HEADING
PRESSURIZING OF A FLAT RUBBER PLATE (CAX6MH) - OGDEN HYPERELASTICITY  
WITH UNIFORM PRESTRESS (RADIAL AND CIRCUMFERENTIAL)
*NODE
1,0.,0.,0.
21,7.5,0.0,0.0
101,0.0,.25,0.0
121,7.5,.25,0.0
201,0.0,.50,0.0
221,7.5,.50,0.0
*NGEN,LINE=P
1,21,1,,2.4
101,121,1,,2.4,.25
201,221,1,,2.4,.50,.0
*NSET,NSET=CENTER
1,101,201
*ELEMENT,TYPE=CAX6MH,ELSET=ONE
1,1,3,203,2,103,102
2,1,203,201,102,202,101
*ELGEN,ELSET=ALL
1,10,2,2
2,10,2,2
*ELSET,ELSET=BOT,GENERATE
1,19,2
*BOUNDARY
121,1,2
CENTER,XSYMM
*EQUATION
2, 
221,1,1.0,21,1,1.0
2, 
221,2,1.0,21,2,1.0
*ELSET,ELSET=ONE
1, 
*SOLID SECTION,MATERIAL=A1,ELSET=ALL
*MATERIAL,NAME=A1
*HYPERELASTIC,OGDEN,N=2
160.,2.,40.,-2.
*INITIAL CONDITIONS,TYPE=STRESS
ALL, 50.,0.,50.
*RESTART,WRITE,FREQUENCY=2
*STEP,NLGEOM, UNSYMM=YES
 MAINTAIN PRESTRESS - THIS STEP IS FOR VERIFICATION PURPOSES OF INITIAL
 STRESSES IN HYPERELASTICITY
*STATIC
*BOUNDARY
CENTER,XSYMM
121,1,2
*EL PRINT,FREQUENCY=5,ELSET=ALL
COORD , E
DG, 
LOADS, 
S,MISES
ENER, 
*EL PRINT,FREQUENCY=1,ELSET=ONE,SUMMARY=NO
COORD , E
DG, 
LOADS, 
S,MISES
ENER, 
*NODE FILE,NSET=CENTER
U ,RF
*OUTPUT,FIELD
*NODE OUTPUT,NSET=CENTER
U,RF
*EL FILE,FREQUENCY=2,ELSET=ONE
S, 
LOADS, 
*OUTPUT,FIELD,FREQ=2
*ELEMENT OUTPUT,ELSET=ONE
S,
LOADS,
*NODE PRINT
U,RF
*END STEP
*STEP,NLGEOM,INC=10, UNSYMM=YES
 APPLY PRESSURE TO RUBBER PLATE
*STATIC,RIKS
.01,1.0,.000001,1.0,1.0,1,1,10000.
CENTER,XSYMM
*CONTROLS, PARAMETERS=FIELD
,1.0
*DLOAD
ALL,P1,2.E+2
*MONITOR,NODE=101,DOF=2
*END STEP