*HEADING
 SQUARE PLATE - ELASTIC BUCKLING ( LOAD INCR )-S8R5 2 x 2
*NODE,NSET=N101
*NODE,NSET=N105
*NODE
*NGEN,NSET=XSYM
*NGEN,NSET=XEDG
*NFILL
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
*SHELL SECTION ,MATERIAL=PLATE,ELSET=EALL
.01,3
*BOUNDARY
YSYM,YSYMM
XSYM,XSYMM
YEDG,3
YEDG,5
XEDG,3
XEDG,4
XEDG,6
*STEP,NLGEOM,INC=40
*STATIC
 .1,1., , 0.1
*CLOAD
105,1,-8.33333333
205,1,-33.3333333
305,1,-16.66666667
405,1,-33.3333333
505,1,-8.3333333
*PRINT,RESIDUAL=NO
*EL PRINT,ELSET=ONE ,SUMMARY=NO,POSITION=CENTROID
S,
*EL FILE,ELSET=ONE ,POSITION=CENTROID
S,
*NODE PRINT,SUMMARY=NO
U,CF1
*NODE FILE,NSET=N101
U,
*NODE FILE,NSET=N105
CF,
*OUTPUT,FIELD,VARIABLE=PRESELECT,FREQUENCY=9999
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=XEDG
CF,
*NODE OUTPUT,NSET=N101
U,
*END STEP