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Shell elements - which nodes

Shell elements - which nodes

Shell elements - which nodes

(OP)
Hi
I simulate a membrane and i apply a voltage between membrane and transducer
Which nodes should I choose to apply a voltage when i use a shell element?
All nodes or should i exclude midside nodes (NSLE,U,MID)?


script:

FINISH
/CLEAR

/CWD,'C:\temp\ansys'


!* membrane
Lm=50
Wm=50
Tm=1  !* Epaisseur de la membrane 3e-6 / 1e-6

!* membrane_division
b=30

!* electrode_distance
h=-0.1
dif=20
a=50

!* voltage
v=7

/PREP7

   ET,1,SHELL93
   R,1,Tm

   ET,2,TRANS126

   MP,EX,1,130e+9*1e-6
   MP,DENS,1,2330*1e-18
   MP,PRXY,1,0.278

   WPOFFS,0,0,dif
   RECTNG,0,Lm,0,Wm
   WPOFFS,0,0,-dif

   LESIZE,ALL,,,b

   MSHAPE,0,2D
   MSHKEY,1
   AMESH,ALL

   !* transducer

   NSEL,S,LOC,Z,dif

  NSLE,U,MID !* Ne pas appliquer de force sur les noeuds médians



   CM,tr,NODE
   ALLSEL,ALL

   EMTGEN,'tr','EMTELM','EMTPNO','UZ',h,0,1E-02,0.8854E-05

   NSEL,S,LOC,Z,dif+h
   D,ALL,,0,,,,UZ
   D,ALL,VOLT,v

   CMSEL,S,TR
   D,ALL,VOLT,0


   !* applying loads and BC

   NSEL,S,LOC,X,0
   NSEL,A,LOC,X,Lm
   NSEL,A,LOC,Y,0
   NSEL,A,LOC,Y,Wm

   D,ALL,UX,0
   D,ALL,UY,0
   D,ALL,UZ,0
   D,ALL,ROTX,0
   D,ALL,ROTY,0
   D,ALL,ROTZ,0

   ALLSEL,ALL
FINISH

/SOLU
   ANTYPE,STATIC

!* Pour prendre en compte le stress stiffening et les grandes déformations
!   NEQIT,100
!   CNVTOL, U, 1, 1e-3
!   NLGEOM,ON
!   SSTIF,ON

   SOLVE
FINISH

/POST1
   PLNSOL,U,Z

   !* Récupération de la flèche qui doit être <= au GAP h
   NSEL,S,LOC,X,Lm/2
   NSEL,R,LOC,Y,Wm/2
   NSEL,R,LOC,Z,dif
   *GET,CENTRE_INFERIEUR,NODE,0,NUM,MIN
   FLECHE=UZ(CENTRE_INFERIEUR)
   NSEL,ALL

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