*HEADING
EC3ISFE2: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED PATCH OF ELEMENTS  [C3D15V]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=OUT
*NODE
*NGEN,NSET=OUT
*NGEN
**   90 1030  470
**   90 1070  490
**  230 1030  400
**  270 1290  510
** 1030 1290  130
** 1070 1290  110
**  160 1160  500
*****
*ELEMENT,TYPE=C3D15V,ELSET=SOLIDS
*ELSET,ELSET=EDRAW
*****
*MATERIAL,NAME=MSOLIDS
*ELASTIC
 1.E6,.25
*DENSITY
7.5E-4,
*SOLID SECTION,ELSET=SOLIDS,MATERIAL=MSOLIDS
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
9, , ,-1.E7
*OUTPUT,FIELD
*MODAL OUTPUT
*CONTROLS,PARAMETERS=FIELD
1.E-14, 1., 10000. , , 1.E-12
*END STEP
*STEP,NLGEOM
*STATIC
*DLOAD
12, P3, -10000.
22, P3, -10000.
42, P3, -10000.
52, P3, -10000.
61, P1, -10000.
62, P1, -10000.
71, P2, -10000.
72, P2, -10000.
*BOUNDARY
10,1,2
70,1,3
90,2,3
270,1
270,3
*EL PRINT,FREQ=0
*NODE PRINT
U,RF
*END STEP
*STEP,NLGEOM
*FREQUENCY, eigensolver=lanczos, SIM=NO
9, , , -1.E+7
*OUTPUT,FIELD
*MODAL OUTPUT
*EL PRINT,FREQ=0
*NODE PRINT,FREQ=0
*BOUNDARY,OP=NEW
*END STEP