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Shell elements - which nodes

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izyk

Mechanical
Dec 4, 2006
21
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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