*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [T3D3E]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=NALL
1,0.
2,1.,2.,3,
3,.5,1.,1.5
*ELEMENT,TYPE=T3D3E, ELSET=EALL
 1,1,3,2
*MATERIAL,NAME=A1
*ELASTIC
30.E6, 
*PIEZOELECTRIC,TYPE=S
15.08,-5.207,-5.207,0.,0.,0.,0.,0.
0.,12.710,0.,0.,0.,0.,0.,0.,
0.,0.
*DIELECTRIC,TYPE=ISO
5.872E-9, 
*DENSITY
7.5E-4, 
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
 .1, 
*STEP,PERTURBATION
FIRST STEP RESTRAINS ALL EPOT, COMPARE WITH T3D311 RESULTS
*FREQUENCY, eigensolver=lanczos, SIM=NO
9, , ,-1.E7 
*BOUNDARY
1,9
2,9
3,9
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP
*STEP,PERTURBATION
SECOND STEP RELEASES ALL BUT ONE EPOT
*FREQUENCY, eigensolver=lanczos, SIM=NO
9, , ,-1.E7 
*BOUNDARY
1,9
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP