Hello everybody,

                  I intend to model an interface crack between 2 different materials in Ansys. I am able to get results (SIF and Energy release rate) for 2D cases by using a 'Pre-meshed' crack. I am not able to define a crack in a simple 3D geometry of a single material (say classical CT specimen). I see there are some limitations to crack modeling in Ansys.

Limitations :

  • Only 'semi-elliptical' crack modeling is possible.
  • Crack has to lie on the 'x-z' plane
  • Crack has to be on a surface/edge
  • Whole crack has to be scoped to one surface and should be on a single body only.
  • Questions :

    • How do I define the crack coordinate system if I have to perform a simple CT test? (check attached image for the problem)
    • If 'pre-defined' crack is the only way out, how do I let ansys know the 'crack front' and associated 'crack front nodes'? (In 2D, I created a named selection to pick the crack tip and created a nodal named selection) I could not do the same for 3D.
    • Is it possible to model an interface crack ie, between 2 different materials? (Limitation 4?)

    Please add to the list of limitations and correct me if I am missing something. Any suggestions would really help me.

    Thanks in advance for your time.

    Regards

    Shreeraman S

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