*HEADING
EC38EFE1: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [C3D8E]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=ALL
 1,0.,0.,0.
 2,7.,0.,0.
 5,0.,7.,0.
 6,7.,7.,0.
 4,0.,0.,-7.
 3,7.,0.,-7.
 8,0.,7.,-7.
 7,7.,7.,-7.
*ELEMENT,TYPE=C3D8E, ELSET=EALL
 1, 1,2,3,4,5,6,7,8
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC
  3.E+6,0.3
*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 NODAL POTENTIALS, COMPARE WITH C3D8 RESULTS
*FREQUENCY, eigensolver=lanczos, SIM=NO
11, , ,-1.E6 
*BOUNDARY
ALL,9
*OUTPUT,FIELD
*MODAL OUTPUT
*END STEP
*STEP,PERTURBATION
SECOND STEP RELEASES ALL BUT ONE NODAL POTENTIALS
*FREQUENCY, eigensolver=lanczos, SIM=NO
9, , ,-1.E6 
*BOUNDARY
1,9
*OUTPUT,FIELD
*MODAL OUTPUT
*OUTPUT,FIELD,MODELIST
7,8,9
*ELEMENT OUTPUT
S,E,EFLX
*OUTPUT,FIELD,MODELIST
7,8,9
*NODE OUTPUT
U, 
*END STEP