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ISTRESS and TRANS126 element

ISTRESS and TRANS126 element

ISTRESS and TRANS126 element

(OP)
Hi
Is there any posibility to perform a simulation with trans128 element and apply initial stress to other element (like shell181)? Ansys v10 gives an error that istress command can be used only for specific elements (shell181 included). However I apply a stres only on shell element, not on trans.

Here is the script:

FINISH
/CLEAR

/FILNAME,mem50shell,0
/CWD,'C:\temp\ANSYS'

!* membrane
Lm=300
Wm=300
Tm=5  !* Epaisseur de la membrane 3e-6 / 1e-6

dif=5
h=-1
V=0

!* membrane_division
b=20

/PREP7

   ET,1,SHELL181
   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,-5

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

   !* transducer

   NSEL,S,LOC,Z,dif

   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
   ALLSEL,ALL

   !* 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

   SFA,1,1,pres,-101300*1E-6  

FINISH

/SOLU
PSTRES,ON
istress,-20e+6*1e-6,-20e+6*1e-6,,,,,1

   ANTYPE,STATIC
   NLGEOM,ON

   SOLVE
FINISH

save,mem50shell,db
fini

 

RE: ISTRESS and TRANS126 element

I believe your error comes from the fact that you have selected all elements when you issue the ISTRESS command. ISTRESS is applied to all currently selected elements, therefore you should use something like:

/SOLU
PSTRES,ON

esel,s,ename,,181    ! select just the SHELL181 elements

istress,-20e+6*1e-6,-20e+6*1e-6,,,,,1

allsel   ! reselect everything

   ANTYPE,STATIC
   NLGEOM,ON

   SOLVE
FINISH
 


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RE: ISTRESS and TRANS126 element

(OP)
it works, thanks

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