*HEADING
360 DEGREES MODEL CORRESPONDING TO 1X2 MESH OF S4R ELEMENTS
*PREPRINT, ECHO=YES, MODEL=YES, HISTORY=YES
*NODE
      1,         -30.,           0.
      2,           0.,          30.
      3,           0.,          50.
      4,         -50.,           0.
      5,         -10.,           0.
      6,           0.,          10.
      7,           0.,         -30.
      8,           0.,         -50.
      9,           0.,         -10.
     10,          30.,           0.
     11,          50.,           0.
     12,          10.,           0.
*ELEMENT, TYPE=S4R
1, 1, 2, 3, 4
2, 2, 1, 5, 6
3, 7, 1, 4, 8
4, 1, 7, 9, 5
5, 10,  7,  8, 11
6,  7, 10, 12,  9
7,  2, 10, 11,  3
8, 10,  2,  6, 12
*ELSET, ELSET=EALL, GENERATE
1, 8, 1
*NSET, NSET=NBC
  5,  6,  9, 12
*SHELL SECTION, ELSET=EALL,MATERIAL=MAT
1., 
*MATERIAL,NAME=MAT
*ELASTIC
10E8,0.3
*DENSITY
100, 
*STEP
*FREQUENCY, EIGENSOLVER=LANCZOS, SIM=NO
12,
*OUTPUT, FIELD, FREQUENCY=0
*END STEP