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Subject: Re: Superelement/Substructuring
Author: Kim Ravn-Jensen
Date: 2001-01-31 03:38:00

Stephane,

Neither I nor Mark should claim to know what you are able to do, but
I'd say that you may be on the right track. I once created a FORTRAN
application on a UNIX system which uses as its native binary format
the same format that ANSYS uses on all platforms. This choice of
software and hardware platform may be the reason why I remember the
whole superelement stiffness retrieval thing as rather
straightforward.

I am at present not authorized to give you any code samples, but I
could pass you the name of somebody who is. You could also start by
asking your ASD for assistance.

K.S. Raghavan's idea of using submodeling kind of scares me. I was
once thoughtless enough to try to optimize a fillet as a submodel.
The optimizer dug away the entire model - no steel, no stresses!

Best regards
Kim Ravn-Jensen

Alfa Laval Copenhagen A/S - Maskinvej 5 - DK-2860 Søborg - Denmark
Phone: +45 39536000 - Direct Phone: +45 39536511 - Fax: +45 39536560
E-mail: kimravn.jensen@a...

P.S.: Your final quote inspires me to pass you the motto of hardcore
programmers: "Documentation is fiction, source is fact."

--- In xansys@y..., Stephane Pierre Bordas wrote:
> Hello,

> For research purposes, my group is thinking of using ANSYS as a
tool to
> generate superelement stiffness matrices for structural stress
analysis.

> At this point, we have an I-DEAS model from which we can export a
> universal file. There may also be a way in which we could export
our model
> to an ANSYS compatible format, but this needs to be checked.

> Our goal is to isolate a given region of this model, and make a
> superelement out of the remainder of the model, whose behavior we
are not
> interested in. Then, we would use this superelement in conjunction
with
> another, more refined mesh for the region of interest and run some
crack
> propagation studies with the code that was written in our
department at
> Northwestern University.

> We don't know much about Ansys, but it seems to us that it would be
the
> way to go. How feasible does it seem to you ? How would you go
about doing
> it ? Has any of you already done it ? Where can I find an example
of this
> kind of study/the format of the superelement file ?
> In particular, is it possible to access the stiffness matrix
representing
> the superelement ?

> Thank you very much for your help,

> Stephane

> Stephane P. Bordas
> Ph.D Student in Theoretical and Applied Mechanics
> Northwestern University, Evanston, IL, U.S.A

> http://www.tam.nwu.edu/sbordas/

> "On ne doit appeler science que l'ensemble des recettes qui
marchent, le
> reste n'est que literature"

> Paul Valery.

Posts possibly associated with message #20664AuthorDateScore
20654Superelement/SubstructuringStephane Pierre Bordas spb276@2001/01/30 
20656Re: Superelement/SubstructuringMartin Liddle2001/01/30 
20664Re: Superelement/SubstructuringKim Ravn-Jensen2001/01/31 
20691Re: Superelement/SubstructuringStephane Pierre Bordas spb276@2001/01/31 
20706Re: Superelement/SubstructuringDan Bohlen2001/01/31 
20739Re: Superelement/SubstructuringGerald Jones2001/02/01 
20960Re: Superelement/SubstructuringK.S. Raghavan2001/02/09 
25447Superelement/Substructuring Analysistap_club@2001/06/29