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Concrete Drucker-Prager Softening Material Model

    • LeaB
      Subscriber

      Dear all,

      for my master thesis I simulate a Timber-Concrete-Composite Beam. Therefore, I should consider cracks in the tension zone of the concrete slab. First idea was to use a concrete Drucker-Prager softening material model (see picture 1).

      I used a patch-test to verify the material model. Unfortunatly, the stress-strain curves under compression and tension are not as I imagined (see picture 2). I attached self-drawn stress-strain curves to show you how they should look like (see picture 3).

      Furthermore, there are Solver-Pivot Warnings during the patch-tests, howerver, the calculation works. But for a simply supported beam the calculation doesn't converge. (I have already defined substeps.)

      Can someone help me please? Did I define the Drucker-Prager softening wrong?

      Thanks in advance!

      Lea

    • Ashish Khemka
      Forum Moderator
      nnThe solver pivot warnings might indicate an unconstrained model. Can you check if the model is constrained properly?.Regards,nAshish Khemkan
    • LeaB
      Subscriber
      nnThanks for your answer. nAnsys is still pretty new to me, so where do I check that? nnRegards,nLean
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