*HEADING
 SQUARE PLATE - ELASTIC BUCKLING  ( THERMAL EXP.  LOAD INCR. )
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=N101
101,  ,  ,1.E-4
*NODE,NSET=N105
105,1.
*NODE
501,0.,1.
505,1.,1.
*NGEN,NSET=XSYM
101,501,100
*NGEN,NSET=XEDG
105,505,100
*NFILL,NSET=TEMP
XSYM,XEDG,4,1
*NGEN,NSET=YSYM
101,105
*NGEN,NSET=YEDG
501,505
*ELEMENT,TYPE=S9R5,ELSET=ONE
1,101,103,303,301,102,203,302,201,202
*ELGEN,ELSET=EALL
1,2,2,1,2,200,2
*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
*STEP,NLGEOM,INC=40
*STATIC
 .1, 1. , , .1
*TEMPERATURE
TEMP,100.
*PRINT,RESIDUAL=NO
*EL PRINT,ELSET=ONE ,SUMMARY=NO,POSITION=CENTROID
S,TEMP
*EL FILE,ELSET=ONE ,POSITION=CENTROID
S,TEMP
*NODE PRINT,SUMMARY=NO
U, 
*NODE FILE,NSET=N101
U, 
*END STEP