*HEADING
 PRESSURIZED RUBBER DISC --- SAX1 ELEMENTS
*NODE
21,0.0,.25
31,7.5,.25
999,0.0,0.249999
*NSET,NSET=DEF
21,
*NGEN,LINE=P,NSET=CENTER
21,31,1,,2.142857143,.2500
*ELEMENT,TYPE=SAX1,ELSET=SHELLS
1,21,22
*ELGEN,ELSET=SHELLS
1, 10,1,1
*ELSET, ELSET=CAVSURF, GENERATE
   1,  10,   1
*SURFACE, TYPE=ELEMENT, NAME=FLSURF
CAVSURF, SNEG
*BOUNDARY
31,1,2
21,XSYMM
*SHELL SECTION, SECTION INT=GAUSS,ELSET=SHELLS,MATERIAL=A1
.05, 
*MATERIAL,NAME=A1
*DENSITY
1.E-4, 
*HYPERELASTIC,N=1
80.,20.,
*PHYSICAL CONSTANTS,ABSOLUTE ZERO=-273.16, UNIVERSAL GAS CONSTANT=73.562
*FLUID CAVITY, NAME=CHAMBER, REF NODE=999, BEHAVIOR=GAS, SURFACE=FLSURF, AMBIENT PRESSURE=14.7

*FLUID BEHAVIOR, NAME=GAS
*MOLECULAR WEIGHT
0.01367
*CAPACITY, TYPE=TABULAR
112.847
*AMPLITUDE,NAME=RAMP
0.,0., .01,1.
**
*STEP
*DYNAMIC,EXPLICIT
,0.01
*BOUNDARY,AMP=RAMP
999,8,8,4.5
*MONITOR,NODE=21,DOF=2
*OUTPUT,FIELD,VAR=PRESELECT,NUM=5
**
** Output for qa testing
**
*NSET,NSET=QA_TEST
CENTER,
*FILE OUTPUT,NUMBER INTERVAL=1
*NODE FILE
 U, 
*OUTPUT,FIELD,NUMBER INTERVAL=1
*NODE OUTPUT,NSET=QA_TEST
 U,
*OUTPUT,HISTORY,VAR=PRESELECT,TIME INTERVAL=0.0025
**
*END STEP