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  1. pevoz23

    Modeling stress dependency of stiffness with USDFLD

    Hi Moustafa Sorry, I just pasted my code which actually contains things you can't know, like df and cl (which are aliases of other modules I wrote). I first reply your questions in the right order: 1) No, this is part of the script I use to create the model. Of course, however, I firstly...
  2. pevoz23

    Modeling stress dependency of stiffness with USDFLD

    Hi Moustafa. Here my code (it should be self explaining): [...] # Keywords without nodes/elements m.keywordBlock.synchVersions(storeNodesAndElements=False) # Get position of *INITIAL blocks init_blocks = [block for block in m.keywordBlock.sieBlocks if ('*INITIAL' in block or '*Initial' in...
  3. pevoz23

    Modeling stress dependency of stiffness with USDFLD

    Hi Moustafa. Sorry I never posted my final solution. I intended to do it, but never had time in the last months... In any case, I solved the problem by initializing the field value for each node in my pressure dependent material with python. To do this, I had to add them to the keywordBlock...
  4. pevoz23

    Modeling stress dependency of stiffness with USDFLD

    Thanks for the reply. I discovered that *INITIAL CONDITION with odb is only possible for . I also had approximately your ideas. Today I tried to implement the first one: I added a step after my geostatic step and i controlled via subroutine the increment time, so that the change in field...
  5. pevoz23

    Modeling stress dependency of stiffness with USDFLD

    Hi Bartosz! Thank you for your reply! Yes, the field variable is the volumetric stress and since I know the initial stress distribution I could calculate the values for each point using its coordinates. The problem is that I don't know how to initialize a field variable which is different for...
  6. pevoz23

    Modeling stress dependency of stiffness with USDFLD

    Hi, I'm trying to model a stress dependency of the Young's modulus of an elasto-plastic soil (Mohr-Coulomb) in Abaqus using the subroutine USDFLD (in plane strain conditions with CPE4 mesh elements). My first simple implementation is: SUBROUTINE...

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