*HEADING
 RING BUCKLE EIGENVALUE ESTIMATE  1 - CAXA8H2    
*NODE
 1,99.5,0.
 3,99.5,1.
11,100.,0.
13,100.,1.
21,100.5,0.
23,100.5,1.
*NGEN
  1,3
 11,13
 21,23
*ELEMENT,TYPE=CAXA8H2,OFFSET=200
1,3,1,21,23,2,11,22,13
*ELSET,ELSET=ALL
 1,
*SOLID SECTION,MATERIAL=MAT,ELSET=ALL
*MATERIAL,NAME=MAT
*ELASTIC
 30.0E6,0.0
*NSET,NSET=NALL,GENERATE
   1,  3,1
  11, 13,1
  21,23,1
 201,203,1
 211,213,1
 221,223,1
 401,403,1
 411,413,1
 421,423,1
*EQUATION
2, 
411,1,1., 11,1,-1.
2, 
413,1,1., 13,1,-1.
*BOUNDARY
 NALL,2
*STEP
*BUCKLE,EIGENSOLVER=SUBSPACE
 2, , ,200
*DLOAD
 ALL,P3,1.0
*EL PRINT,FREQUENCY=0
*NODE PRINT ,SUMMARY=NO
U,RF
*MODAL PRINT
*MODAL FILE
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP