*HEADING
 RING BUCKLING ANALYSIS, CPS8R, 4 X 10 MESH
*NODE
*NGEN,NSET=SYM
*NGEN,NSET=VARY
*NGEN,NSET=INNER,LINE=C
*NGEN,NSET=OUTER,LINE=C
*NFILL,NSET=ALL
INNER,OUTER,8,100
*ELEMENT,TYPE=CPS8R
*ELGEN,ELSET=EALL
*ELSET,GENERATE,ELSET=LOAD
*MATERIAL ,NAME=A1
*ELASTIC
30.0E6,0.0
*SOLID SECTION,MATERIAL=A1,ELSET=EALL
1.0,
*TRANSFORM, NSET=VARY
*BOUNDARY
SYM,2
VARY,2
*STEP
*BUCKLE
1,
*BOUNDARY,LOAD CASE=2, OP=NEW
SYM,2
VARY,1
*DLOAD
LOAD,P2,1.0
*NODE PRINT ,SUMMARY=NO
U,RF
*MODAL PRINT
*MODAL FILE
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP