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prestressed modal analysis of a plate

prestressed modal analysis of a plate

prestressed modal analysis of a plate

(OP)
Hi,
I'm trying to make a prestressed modal analysis of a plate but the results i'm getting (frequencies) are the same as the results from the modal analysis without the membrane forces i'm aplying. I think i've followed the correct procedure:

1.Build the model and obtain a static solution with prestress effects turned on.
2.Reenter SOLUTION and obtain the modal solution, also with prestress effects turned on (reissue PSTRES,ON).

I'm using the shell91 element with these boundary conditions

DK,1, , , ,0,UX,UZ
DK,4, , , ,0,UX

*DO,i,1,4
DL,i, ,UY,
*ENDDO
 
and these membrane pressure:

SFL,1,PRES,-3000,
SFL,3,PRES,-3000,
SFL,2,PRES,+3000,
SFL,4,PRES,+3000,

 

here's the relevant section of my logfile (feel free to point out any errors):


FINISH  

/SOL
ANTYPE,0  
PSTRES,ON    
/STATUS,SOLU
SOLVE   
FINISH  

/SOLU    
/SOL
!*  
ANTYPE,2

MODOPT,LANB,5   
EQSLV,SPAR  
MXPAND,5, , ,0  
LUMPM,0
PSTRES,1
!*  
MODOPT,LANB,5,0,0, ,OFF
/STATUS,SOLU
SOLVE

FINISH


thanks,
J.

 

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