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VUMAT

Submitted by bagheriasl on
I see what you mean and I think your intention is that if we use user subroutine we can not observe the plastic starin in it specialy when we use VUMAT????


onther is that i define peeq and plastic starin as well as incerement of plastic starin as sate variables but you mean when we define it we can get the result in the field put???? but i couldn't get it. If the answer is no so where the state variables which define at routine b stored and how can i reach it??


please handle me more, i realy need to it immediatly


 


thaks alot


sincerely 
Frank Richter

When using subroutines only YOU know what is plastic strain, ABAQUS does not. ABAQUS knows only STRAN and DSTRAN fed into the routine, it is up to the user to interpret the individual strain terms inherent to the constitutive behavior.

You might have in your code something like

plastic strain = blabla, some formula

Then define

STATEV(1) = plastic strain

This result will show as SDV1 in the field output.

Do this for all tensor components individually.

Note: you have to define the number of state variables in the input file (6 if you follow this procedure for all components) and to request the output quantity SDV under the command ELEMENT OUTPUT.

Get the file

http://imechanica.org/files/Writing User Subroutines with ABAQUS.pdf

it may show up as

http://imechanica.org/files/Writing%20User%20Subroutines%20with%20ABAQUS.pdf

------------------------------------------
Ruhr-University
Bochum
Germany

Wed, 11/07/2012 - 16:22 Permalink
bagheriasl

Thanks alot, you gave a big favor to me and I appreciated that.

So I have to define all tensor component individually as sate variables alike before I did and then I defien the number of state variables in DEPVAR option as well as user material constants. I have done it. Then as you told all the state variables must be shown in field output? you mean when we define state variables and update it then we can observe the SDVs at the visualization modul\odb field output or it will save in a separate file???

sorry I have another question and it is that I can't open the .RES file which is produced during compiling, in the other word I can open it by Notepad but all the characters are obsecure like machine language. how can I acsess to the .RES file?

I am so gratefull of you

Regards

Wed, 11/07/2012 - 17:19 Permalink