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prestress stiffness matrix

prestress stiffness matrix

prestress stiffness matrix

(OP)
Hi
I need to post-process the stiffness matrix (obtained by ANSYS) of a pre-stressed structure.  I did the following passages after builiding and loading opportunely my FE model

/SOLU
ANTYPE,STATIC          
!*NLGEOM,ON             
PSTRES,ON              
ematwrite,yes
SOLVE
FINISH
/SOLU    
ANTYPE,2
UPCOORD,1.0,ON   
MODOPT,LANB,24  
EQSLV,SPAR  
MXPAND,24, , ,0
LUMPM,0
PSTRES,ON  
MODOPT,LANB,24,0,1000, ,OFF
ematwrite,yes
/STATUS,SOLU
SOLVE
FINISH

I expect that the EMAT file contains both stiffness and stress stiffening matrices but the stiffness matrix that I obtain is exactly the same of the unstressed structure.

Can anyone help?

 

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