*HEADING
 L-shaped bracket
 544 continuum element mesh, non-linear buckling analysis
*NODE
**
**
*ELEMENT, TYPE=C3D20R, ELSET=EALL
**
*NSET, NSET=WALL
**
*NSET, NSET=TIP
**
*SOLID SECTION, MATERIAL=A1,ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC
 71240, 0.31
*BOUNDARY
 WALL,1,6
*IMPERFECTION,FILE=lbracket_buckle_c3d20r,STEP=1
*STEP,NLGEOM,INC=50
*STATIC,RIKS
 0.01,1.0,,,1.0
*CLOAD
 TIP,1,1.4
*OUTPUT,FIELD,FREQUENCY=50
*NODE OUTPUT,NSET=TIP
U,
*NODE FILE, FREQUENCY=50,NSET=TIP
 U,
*OUTPUT,HISTORY,variable=preselect
*NODE OUTPUT,NSET=TIP
U,
*ENDSTEP