XANSYS Message #: 20721

XANSYS Message: 20721 [Go back to message list]
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Subject: Re: Substructuring/Superelement/Crack propagation
Author: Stephane Pierre Bordas spb276@
Date: 2001-01-31 19:09:00

Yes, thank you very much. However, what I need is the stiffness of the structure surrounding the area of interest since this will me the part which will not change but cause changes in the way cracks propagate in the area of interest (because of extra stiffness). The model I have is huge and it will not be only the task to get the resulting 6X6 stiffness matrix. I am not only studying one element but a whole bunch of them. Do you see what I mean now ? Thanks, Stephane On Wed, 31 Jan 2001, Roth, John wrote: > If you can isolate the area of interest and apply loads (FX, FY, etc) for > all 6 dof, you can generate, by hand, very easily, the resulting 6 x 6 > stiffness matrix, based on the response at chosen points. Remember, > stiffness is only a ratio of input load to output displacement. > -----Original Message----- > From: sbordas@y... [mailto:sbordas@y...] > Sent: Tuesday, January 30, 2001 5:08 PM > To: xansys > Subject: [xansys] Substructuring/Superelement/Crack propagation > 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 #20721		Author	Date
`20652`	`Substructuring/Superelement/Crack propagation`	`sbordas@`	`2001/01/30`
`20717`	`Re: Substructuring/Superelement/Crack propagation`	`Roth, John jroth@`	`2001/01/31`
`20721`	`Re: Substructuring/Superelement/Crack propagation`	`Stephane Pierre Bordas spb276@`	`2001/01/31`