*HEADING
: NAFEMS TEST FV12, [S4R]
Shell Elements -- Free thin square plate
*NODE
*NGEN,NSET=BOT
*NGEN,NSET=TOP
*NFILL,NSET=NALL
BOT,TOP,8,100
*ELEMENT,TYPE=S4R
*ELGEN,ELSET=ELALL
*SHELL SECTION,MATERIAL=MAT1,ELSET=ELALL
.05,
*MATERIAL,NAME=MAT1
*ELASTIC
2E11,0.3
*DENSITY
8000,
*BOUNDARY
NALL,1,2
NALL,6
*STEP
*FREQUENCY, eigensolver=lanczos
11, , ,-1E-1
*OUTPUT,FIELD,VAR=PRESELECT,MODELIST
*ENDSTEP