*HEADING
EC38SIE2: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED PATCH OF ELEMENTS  [C3D8I]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE
10,0.,0.,1.
20,1.,0.,1.
120,1.,0.,0.
110,0.,0.,0.
100,0.32,0.186,0.643
202,0.677,0.305,0.683
302,.826,.288,.288
400,.249,.342,.192
102,.165,.745,.702
200,.788,.693,.644
300,.850,.649,.263
402,.273,.750,.230
12,0,1,1
22,1,1,1
320,1,1,0
420,0,1,0
*NSET,NSET=SIDES
10, 
20, 
110, 
120, 
12, 
22, 
320, 
420, 
*ELEMENT,TYPE=C3D8I, ELSET=EALL
1,10,20,120,110,100,202,302,400
2,10,100,400,110,12,102,402,420
3,100,202,302,400,102,200,300,402
4,202,20,120,302,200,22,320,300
5,102,200,300,402,12,22,320,420
6,302,120,110,400,300,320,420,402
7,20,202,100,10,22,200,102,12
*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
9, , ,-1.E6
*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, P4, -10000.
7, P6, -10000.
*BOUNDARY
10,1,2
110,1,3
120,2,3
420,1
420,3
*EL PRINT,FREQ=0
*NODE PRINT
U,RF
*END STEP
*STEP,NLGEOM
*FREQUENCY, eigensolver=lanczos, SIM=NO
9, , , -1.E+2 
*OUTPUT,FIELD
*MODAL OUTPUT
*EL PRINT,FREQ=0
*NODE PRINT,FREQ=0
*BOUNDARY,OP=NEW
*END STEP