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-   -   A simple plastic solid model in FSI (http://www.cfd-online.com/Forums/main/15121-simple-plastic-solid-model-fsi.html)

 jinwon park April 26, 2008 09:18

A simple plastic solid model in FSI

I am simulating an internal explosion problem in a water-filled cylinder. This example requires the modeling of plastic deformation of cylinder wall. However, I am not a solid expert. If someone know about a simple plastic solid model workable with a compressible CFD code, please advice me.

 abouziar April 28, 2008 07:53

Re: A simple plastic solid model in FSI

use elastic case for solids on the boundary for FSI problem and Fon Mises criterea without hardening to cut the stress component inside solids (see Wilkins or Autodyn or other manuals)

 jinwon park April 28, 2008 07:55

Re: A simple plastic solid model in FSI

Could you detail about "Wilkins?" Is it a commercial code? You meant that if the effective stress in the solid satisfies than the Von-Mises yield condition, cut the solid component. Is it right?

 abouziar April 28, 2008 08:32

Re: A simple plastic solid model in FSI

Wilkins means a REFERENCE M.L. Wilkins, Calculation of elastic-plastic flow, in Methods in Computational physics, edited by B.Alder, S.Fernbach, and M. Rotenbeg (Academic, New York, 1964), Vol.3,p.211 or look into G.H. Miller and P. Colella. A high-order Eulerian Godunov method for elastic-plastic flow in solids, J. Comput. Phys. 167, 131-176 (2001).

you have to cut the deviatoric components of your stress tenzor 1. calculate elastic problem 2. calculate the second invariants of your deviatoric elastic tenzor,

compare it with Von Mises 3. if it is plastic case , calculate the coeeficiant to correct your deviatoric componentes in accordence with Von Mises (look at Wilkins for example) 4. time your deviatorice terms (decrease them) on this coefficiant

 jinwon park April 28, 2008 09:32

Re: A simple plastic solid model in FSI

I really appreciate your help. It is pretty helpful. Now, I checked the avalivility of this article but I could not get it right now. Mind if I ask you the photocopy of that article. If not, it's okay

 abouziar April 28, 2008 09:55

Re: A simple plastic solid model in FSI

your welcome, this Milerrs&Colella's you could find in their web page, make search in Google, also may be they have there references to other Wilkins

 jinwon park April 29, 2008 09:15

Re: A simple plastic solid model in FSI

Could you detain the keyword to search that paper? I could not find anything else by that keyword. Thanks in advance!

 abouziar April 30, 2008 05:05

Re: A simple plastic solid model in FSI

go into here http://seesar.lbl.gov/anag/publication.html

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