*HEADING
EC36SFE2: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED PATCH OF ELEMENTS  [C3D6]
*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
*****
*ELEMENT,TYPE=C3D6, ELSET=EALL
  11,1010,  10,1070,1030,  30,1090
  12,  10,  70,1070,  30,  90,1090
  21,1210, 210,1270,1010,  10,1070
  22, 210, 270,1270,  10,  70,1070
  31,1070,1090,1270,1010,1030,1210
  32,1090,1290,1270,1030,1230,1210
  41,1030,  30,1090,1230, 230,1290
  42,  30,  90,1090, 230, 290,1290
  51,1230, 230,1290,1210, 210,1270
  52, 230, 290,1290, 210, 270,1270
  61,  70,  90, 270,1070,1090,1270
  62,  90, 290, 270,1090,1290,1270
  71,1010,1030,1210,  10,  30, 210
  72,1030,1230,1210,  30, 230, 210
*****
*SOLID SECTION,MATERIAL=MAT, ELSET=EALL
*MATERIAL,NAME=MAT
*ELASTIC
 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
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+2 
*OUTPUT,FIELD
*MODAL OUTPUT
*EL PRINT,FREQ=0
*NODE PRINT,FREQ=0
*BOUNDARY,OP=NEW
*END STEP