*HEADING
EC3KSFE2: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED PATCH OF ELEMENTS  [C3D20]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE
 10, 0.,0.,1.
 30, 1.,0.,1.
 70, 0.,0.,0.
 90, 1.,0.,0.
 210, 0.,1.,1.
 230, 1.,1.,1.
 270, 0.,1.,0.
 290, 1.,1.,0.
 1010, .32,.186,.643
 1030, .677,.305,.683
 1070, .249,.342,.192
 1090, .826,.288,.288
 1210, .165,.745,.702
 1230, .788,.693,.644
 1270, .273,.750,.230
 1290, .850,.649,.263
*NGEN
 10,30,10
 70,90,10
 10,70,30
 20,80,30
 30,90,30
 210,230,10
 270,290,10
 210,270,30
 220,280,30
 230,290,30
 10,210,100
 20,220,100
 30,230,100
 40,240,100
 60,260,100
 70,270,100
 80,280,100
 90,290,100
*****
 1010,1030,10
 1070,1090,10
 1010,1070,30
 1020,1080,30
 1030,1090,30
 1210,1230,10
 1270,1290,10
 1210,1270,30
 1220,1280,30
 1230,1290,30
 1010,1210,100
 1020,1220,100
 1030,1230,100
 1040,1240,100
 1060,1260,100
 1070,1270,100
 1080,1280,100
 1090,1290,100
*****
 10,1010,500
 20,1020,500
 30,1030,500
 40,1040,500
 50,1050,500
 60,1060,500
 70,1070,500
 80,1080,500
 90,1090,500
 110,1110,500
 120,1120,500
 130,1130,500
 140,1140,500
 160,1160,500
 170,1170,500
 180,1180,500
 190,1190,500
 210,1210,500
 220,1220,500
 230,1230,500
 240,1240,500
 250,1250,500
 260,1260,500
 270,1270,500
 280,1280,500
 290,1290,500
*****
*ELEMENT,TYPE=C3D20, ELSET=EALL
 1, 10,30,90,70, 1010,1030,1090,1070, 20,60,80,40, 1020,1060,1080,
    1040, 510,530,590,570
 2, 10,1010,1070,70, 210,1210,1270,270, 510,1040,570,40, 710,1240,770,
    240, 110,1110,1170,170
 3, 1010,1030,1090,1070,1210,1230,1290,1270,1020,1060,1080,1040,1220,1260,1280,
    1240, 1110,1130,1190,1170
 4, 1030,30,90,1090, 1230,230,290,1290, 530,60,590,1060, 730,260,790,
    1260, 1130,130,190,1190
 5, 1210,1230,1290,1270, 210,230,290,270, 1220,1260,1280,1240, 220,260,280,
    240, 710,730,790,770
 6, 1070,1090,90,70, 1270,1290,290,270, 1080,590,80,570, 1280,790,280,
    770, 1170,1190,190,170
 7, 10,30,1030,1010, 210,230,1230,1210, 20,530,1020,510, 220,730,1220,
    710, 110,130,1130,1110
*****
*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.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