*HEADING
 SQUARE PLATE - ELASTIC BUCKLING ( THERMAL EXP. LOAD INCR. )
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*RESTART,WRITE,FREQ=1
*NODE,NSET=N101
*NODE,NSET=N105
*NODE
*NGEN,NSET=XSYM
*NGEN,NSET=XEDG
*NFILL,NSET=TEMP
XSYM,XEDG,4,1
*NGEN,NSET=YSYM
*NGEN,NSET=YEDG
*ELEMENT,TYPE=S8R5,ELSET=ONE
*ELGEN,ELSET=EALL
*MATERIAL ,NAME=PLATE
*ELASTIC
1.E8,.3
*EXPANSION
1.E-6,
*SHELL SECTION ,MATERIAL=PLATE,ELSET=EALL
.01,3
*BOUNDARY
YSYM,YSYMM
XSYM,XSYMM
YEDG,3
YEDG,5
XEDG,1
XEDG,3
XEDG,4
XEDG,6
*INITIAL CONDITIONS, TYPE=TEMPERATURE
TEMP, 0.0
*STEP,NLGEOM,INC=40
*STATIC
 .1, 1. , , .1
*TEMPERATURE
TEMP,100.
*PRINT,RESIDUAL=NO
*EL PRINT,ELSET=ONE ,SUMMARY=NO,POSITION=CENTROID
S,
*EL FILE,ELSET=ONE ,POSITION=CENTROID
S,TEMP
*NODE PRINT,SUMMARY=NO
U,
*NODE FILE,NSET=N101
U,
*NODE FILE,NSET=YSYM
RF,
*OUTPUT,FIELD,VARIABLE=PRESELECT,FREQUENCY=9999
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=XEDG
RF,
*NODE OUTPUT,NSET=N101
U,
*END STEP