*HEADING
ECA8SFE2: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED PATCH OF ELEMENTS  [CAX8]
**PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE
10,1.0,0
20,1.24,0.
30,1.24,.12
40,1.,.12
50,1.12,0.
60,1.24,.06
70,1.12,.12
80,1.0,.06
102,1.04,.02
104,1.18,.03
204,1.16,.08
202,1.08,.08
*NGEN
102,104
202,204
102,202,50
104,204,50
10,102,46
40,202,81
30,204,87
20,104,42
*ELEMENT,TYPE=CAX8,ELSET=ONE
1,10,20,104,102,50,62,103,56
2,10,102,202,40,56,152,121,80
3,102,104,204,202,103,154,203,152
4,104,20,30,204,62,60,117,154
5,202,204,30,40,203,117,70,121
*SOLID SECTION,MATERIAL=A1,ELSET=ONE
**.001
*MATERIAL,NAME=A1
*ELASTIC,TYPE=ISOTROPIC
30.E6,.3
*DENSITY
7.5E-4, 
*NSET,NSET=SIDES,GENERATE
10,80,10
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
5, , ,-1.E7 
*MODAL FILE
*CONTROLS,PARAMETERS=FIELD
1.E-14, 1., 10000. , , 1.E-12
*END STEP
*STEP,NLGEOM
*STATIC
*DLOAD
1, P1, -10000.
2, P4, -10000.
4, P2, -10000.
5, P3, -10000.
*BOUNDARY
10,1,2
20,2
*EL PRINT,FREQ=1
*NODE PRINT
U,RF
*END STEP
*STEP,NLGEOM
*FREQUENCY, eigensolver=lanczos, SIM=NO
5, , , -1.E+7 
*MODAL FILE
*EL PRINT,FREQ=1
*NODE PRINT,FREQ=0
*BOUNDARY,OP=NEW
*END STEP