Learning Forum

[Sebastien ARRIVET]

Hi,

I'm trying to run a modal analysis with pre-stress.

I wrote this under:

 

/SOL

!PreStress

ANTYPE,0

PSTRES, ON

SOLVE

FINISH

/SOL

!Modal Analysis

ANTYPE,2

MODOPT,LANB,5,0,0, ,OFF

EQSLV,SPAR  

MXPAND,ALL, , ,YES  

LUMPM,0

PSTRES,ON

SOLVE

save,analyse_modale,db,,all

 

 

When ran separatly, both step works fine: the static step is correctly computed, and the result match with analytical solution.

 

However when ran before the modal analysis the db doesn't store the static solution. I've tried to multiply "save" command, but it didn't work.

 

Idealy I would like a single .db with the first static step and the second modal step.

 

Do you have any idea as to why it doesn't work ?

 

Thanks for your help,

Seb

[Dave Looman]

The database can only store one set of results.  It's more typical to store results on the rst file.  It may be possible to have both the static and modal results on the same results file, but that's not typical or easy to do.  Why not issue save,static,db after the static?  The reswrite command can be used to append results to an existing rst file.

[Sebastien ARRIVET]

Thanks for your answer ! I'm not used to ANSYS APDL, so I had no idea. I will try rewrite in order to keep both results.

[Ashish Kumar]

Hi Seb,

 

Please see if the following link helps: 3.6. Applying Prestress Effects in a Modal Analysis (ansys.com)

PowerPoint Presentation (ansys.com)

 

Regards,

Ashish Khemka