Results 1 to 3 of 3

Thread: ABAQUS, subroutine USDFLD and plastic model

  1. #1

    ABAQUS, subroutine USDFLD and plastic model

    Hello,
    I'm modeling a material which its stress strain can be approximately bilinear so it has an certain Emodulus at the begining and then in the plastic region it has another E value.

    I've tried to model it as classic metal plasticity. I then added the subroutine USDFLD to give those two values of E.

    I feel confused now. When I'm modeling such a material am I supposed to use that subroutine to change the E or use a plasticity model? Actually I don't get the difference between the function of both. (Plastic material model and subroutine USDFLD)

    Thanks a lot in advance,
    Regards,

  2. #2
    to me, i think you'd better read more on user manual and books. fot your case, i think it is more suitable to write a UMAT other than USDFLD which is giving field variable. the general idea of UMat is to include the material model. for your specific case, you can define a critiario when the plasticity begins, before which E=E_elastic,and after which E=E(stress). I guess you can find this code in Abaqus user subroutine publication. it is very typical.

  3. #3
    Join Date
    2000-02
    Location
    Boston, USA
    Posts
    3,321
    I agree with sony020244, in addition, can you not simply use the standard elastic-plastic material model?

    Simple metal plasticity will have an initial elastic response followed by a plastic response that can be linear during monotonically increasing strain.

    -Jorgen
    Jorgen Bergstrom, Ph.D.
    PolymerFEM Administrator

Similar Threads

  1. Elastic-Perfectly Plastic in Abaqus Explicit
    By gadoo77 in forum Constitutive Models
    Replies: 6
    Last Post: 2009-06-11, 16:15
  2. User Subroutine USDFLD with GETVRM
    By Carol in forum Finite Element Modeling
    Replies: 3
    Last Post: 2009-01-12, 03:51
  3. min/max in USDFLD (ABQ)
    By meta82 in forum Constitutive Models
    Replies: 1
    Last Post: 2008-10-26, 20:47
  4. Trouble with USDFLD
    By gautambalaram in forum Finite Element Modeling
    Replies: 2
    Last Post: 2008-08-21, 08:25
  5. VUMAT /Boyce 1988 Polymer Large Plastic Deformation Model
    By radarvizeh in forum Constitutive Models
    Replies: 3
    Last Post: 2008-07-10, 19:35

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •