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General Mechanical

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The fracture parameters computed during solution may be incorrect

    • Mn65
      Subscriber

      I'm trying to determine the energy release rate at the crack tip of an adhesive. a simple 2D model has been created and a pre-mesh crack was created also. The following warning always appears after solving the problem.

       

       

      "The fracture parameters computed during solution may be incorrect. Check the Solver Output on the Solution Information object for possible causes".

      When I check the Solver output I see the following points:

      1-  Fracture parameter calculation issue: crack tip node is attached to an element type that is not supported, Crack 1, crack tip node 15,  element type 169.  The element will be ignored.

      2- Fracture parameter calculation issue: Contour integration for crack 1  includes contact elements that are not supported.  These elements are ignored, and the contour integration results may not be correctly calculated. 

       

      Could you please help me to find a solution to remove this warning? 

    • Ashish Khemka
      Forum Moderator

      Hi,

       

      For the warning message, in the contact scoping you should remove the surface segments connecting the tip node from the definition.

       

      Regards,

      Ashish Khemka

       

       

      • Mn65
        Subscriber

        Thank you so much. Could you please explain how can I do that?

    • Mathu M
      Subscriber

      I am also facing similar issue. How to solve it? The warning is " Fracture parameter calculation issue: crack tip node is attached to element type that is not supported, Crack 1, crack tip node 1, element type 174. Element will be ignored."

    • Ashish Khemka
      Forum Moderator

      Hi,

      For deselecting the surface, you can click on control and then select the surface to be removed.

      Regards,

      Ashish Khemka

    • David Weed
      Ansys Employee

      Hello,

      The warning message is most likely caused by J-integral and SIF calculations being requested. These calculation methods are not supported with surface effect and contact/target elements (which includes TARGE169, the element type the warning message mentions). Set both SIFs and J-integral to 'No' under Analsyis Settings > Fracture Controls:

      The warning message should go away and only ERR will be calculated.

    • Mathu M
      Subscriber

      Hi,

      I am using the APDL meshed file imported into WB. I could not find the way to deselect surface or select only nodes. The crack definition is already there in APDL file. I could not recreate the model in WB as load case data sets are based on APDL nodal data. How to solve this issue?

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