*HEADING
EC3FEFE1: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [C3D15E]
*PREPRINT,ECHO=YES,HISTORY=YES,MODEL=YES
*NODE,NSET=ALL
  1, 0.0, 0.0, 0.0
  2, 2.0, 0.0, 0.0
  3, 2.0, 2.0, 0.0
  4, 0.0, 2.0, 0.0
  5, 0.0, 0.0, 1.0
  6, 2.0, 0.0, 1.0
  7, 2.0, 2.0, 1.0
  8, 0.0, 2.0, 1.0
  9, 1.0, 0.0, 0.0
 10, 2.0, 1.0, 0.0
 11, 1.0, 2.0, 0.0
 12, 0.0, 1.0, 0.0
 13, 1.0, 0.0, 1.0
 14, 2.0, 1.0, 1.0
 15, 1.0, 2.0, 1.0
 16, 0.0, 1.0, 1.0
 17, 0.0, 0.0, 0.5
 18, 2.0, 0.0, 0.5
 19, 2.0, 2.0, 0.5
 20, 0.0, 2.0, 0.5
 21, 1.0, 1.0, 0.0
 22, 1.0, 1.0, 1.0
 23, 1.0, 0.0, 0.5
 24, 2.0, 1.0, 0.5
 25, 1.0, 2.0, 0.5
 26, 0.0, 1.0, 0.5
 27, 1.0, 1.0, 0.5
*ELEMENT,TYPE=C3D15E, ELSET=EALL
 1, 1,2,4,5,6,8,9,21,12,13,22,16,17,18,20
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC
 3.E6,0.3
*PIEZOELECTRIC,TYPE=S
15.08,-5.207,-5.207,0.,0.,0.,0.,0.
0.,12.710,0.,0.,0.,0.,0.,0.,
12.710,0.
*DIELECTRIC,TYPE=ISO
5.872E-9, 
*DENSITY
7.5E-4, 
*STEP,PERTURBATION
FIRST STEP RESTRAINS ALL EPOT, COMPARE WITH C3D1511 RESULTS
*FREQUENCY, eigensolver=lanczos
9, , ,-1.E7
*BOUNDARY
ALL,9
*OUTPUT,FIELD
*MODAL OUTPUT
*END STEP
*STEP,PERTURBATION
SECOND STEP RELEASES ALL BUT ONE EPOT
*FREQUENCY, eigensolver=lanczos
9, , ,-1.E7
*BOUNDARY
1,9
*OUTPUT,FIELD
*MODAL OUTPUT
*END STEP