*HEADING
  SSD with AMS for C3D8
*NODE, NSET=NALL
 1, 0, 0, 0
 2, 2, 0, 0
 3, 2, 2, 0
 4, 0, 2, 0
 5, 0, 0, 2
 6, 2, 0, 2
 7, 2, 2, 2
 8, 0, 2, 2
*ELEMENT, TYPE=C3D8, ELSET=EALL
 1, 1,2,3,4,5,6,7,8
*SOLID SECTION, ELSET=EALL, MATERIAL=MAT
*MATERIAL, NAME=MAT
*HYPERELASTIC
3.2E6, 0.8E6, 0.001
*DENSITY
1000., 
*DAMPING, ALPHA=0.01, BETA=0.02
*BOUNDARY
 1,1,3
 2,1,3
 3,1,3
*NSET, NSET=SIDE_1
 6, 7
**
** Frequency extraction using AMS
**
*STEP
*FREQUENCY, EIGENSOLVER=Lanczos, NORMAL=MASS, NSET=SIDE_1
12, 0.0, 15.
*OUTPUT, FIELD
*NODE OUTPUT, NSET=SIDE_1
U,
*END STEP
**
** Steady state dynamics with material damping
**
*STEP, NAME=SSD, PERTURBATION
*STEADY STATE DYNAMICS, SUBSPACE PROJECTION, FREQUENCY SCALE=LINEAR, INTERVAL=EIGENFREQUENCY
5.,
*SELECT EIGENMODES, GENERATE
1,15,1
*CLOAD
SIDE_1, 1, 1E5
**
** OUTPUT REQUESTS
**
*OUTPUT, FIELD
*NODE OUTPUT, NSET=SIDE_1
U,
*NODE PRINT, NSET=SIDE_1
U,
*MODAL PRINT
GU,
*END STEP