How to update Young modulus according to change in plastic strain in Abaqus GUI

[kooshaa]

Hi Everyone. My materials Young's modulus (E) is changing with the increasing of the plastic strain.
How can I implement this behaviour in abaqus GUI (since I'm not good in scripting)?

 

[Mustaine3]

That won't work.

I see options with a UMAT subroutine or with field variables combined with a UAMP subroutine.

 

[kooshaa]

True. I have not found any way to change the Young's modulus (E) in the Abaqus GUI.

I tried to write a VUSDFLD subroutine (my model is Dynamic Explicit and since I am an absolute beginner I would like to avoid VUMAT).
I found an old thread here (

http://www.eng-tips.com/viewthread.cfm?qid=295995)

which gave me some clue in what I should write (Although they used USDFLD subroutine).

Here is my VUSDFLD subroutine:

http://files.engineering.com/getfil...840-58be1f625369&file=subroutine_-_Last.forre

Here are my questions:
1- The young's modulus of my material model in changing with the engineering strain (which contain both elastic and plastic strain) (I made a mistake when writing the topic of this thread). Does my subroutine cover both parts? and did I use right codes for it?

2- Should I just add the Data written below in the Elastic section of material property module (since it also contain the plastic strain)? and if I do so, would abacus recognize when the strain reached the plastic zone?

E ------ Engineering Strain
203050 0
186750 0.01
174750 0.02
168450 0.03
163900 0.04
159800 0.05
156100 0.06
152850 0.07
148950 0.08