XANSYS Message: 20960 [Go back to message list]
[bookmark on del.icio.us]
No rating yet
Rate item:

Subject: Re: Superelement/Substructuring
Author: K.S. Raghavan
Date: 2001-02-09 02:44:00

Hi Stephane,

This thread is getting revived. Here is a brief description of of what I have
carried out relevant to the topic.

With a coarse model I carried out plane stress analysis of an L - bracket.
Independently I made a fine mesh of the filleted corner portion of the L
bracket
with a crack tip. This model was analyzed for imposed displacements
on the cut edges . These displacements were interpolated from the results
of full bracket analysis. Solution was carried out and SIF was computed. QED.

The fine mesh was also generated using ANSYS. But any other program could also
have been used. All that would be needed is a program that would carry
out interpolations using appropriate shape functions for which the coarse model
DOF results can be manually input.

Hope that this post answer all the questions raised in your first post and also
those raised in subsequent posts.

Regards .. raghavan (BHEL , Hyderabad , INDIA)

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 #20960AuthorDateScore
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