*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [SC6R]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=NALL
*ELEMENT,TYPE=SC6R, ELSET=EALL
*SHELL SECTION,MATERIAL=A1, ELSET=EALL
1,3
*MATERIAL,NAME=A1
*ELASTIC
30.E6,.3
*DENSITY
7.5E-4,
*STEP
*FREQUENCY, eigensolver=lanczos
16, , ,-1.E7
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP