*HEADING
EC3KSRE2: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED PATCH OF ELEMENTS  [C3D20R]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE
*NGEN
*****
*****
*****
*ELEMENT,TYPE=C3D20R, ELSET=EALL
*****
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC,TYPE=ISOTROPIC
 1.E6,.25
*DENSITY
7.5E-4,
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
15, , ,-1.E7
*OUTPUT,FIELD
*MODAL OUTPUT
*CONTROLS,PARAMETERS=FIELD
1.E-14, 1., 10000. , , 1.E-12
*END STEP
*STEP,NLGEOM
*STATIC
*DLOAD
1, P1, -10000.
2, P6, -10000.
4, P4, -10000.
5, P2, -10000.
6, P5, -10000.
7, P3, -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
10, , , -1.E+7
*OUTPUT,FIELD
*MODAL OUTPUT
*EL PRINT,FREQ=0
*NODE PRINT,FREQ=0
*BOUNDARY,OP=NEW
*END STEP