General Mechanical

General Mechanical

fracture Analysis for shell elment

    • Abdoon075
      Subscriber

      Hello experts ,,,,, 


      I'm going to do a fracture analysis for stiffened panel by using shell element, but I can't complete the pre-meshed crack modeling because I have to select an "Edge" for crack tip when I just have a "Point" (which is the green point in the attached pic.) because the panel is shell element not solid element


      please help me ... 

    • peteroznewman
      Subscriber

      You have to use the Geometry editor to cut a Vee shaped crack into the edge of the sheet. Then you will have two edges that define the crack and a vertex at the crack tip.

    • Abdoon075
      Subscriber

      thanks for your reply Mr. Peter


      When I select the tow edges and create Named selection They didn't defined in details of pre-meshed crack  

    • peteroznewman
      Subscriber

      I know a crack is supported in a 2D model, I don't know if a crack in a 3D shell models is supported.


      Please get some experience using a pre-meshed crack in either a 2D model or a 3D solid model first, then you will know what success looks like.


      You must create nodal named selections and you must create a coordinate system in the crack. Please read some ANSYS Help for more information.

    • Abdoon075
      Subscriber

      In 2D model the crack tip must be a vertex, so the nodal named selection must be a point or a vertex. I tried 2D model and its work correctly. In 2D Model I must model the stiffeners as Line body, because in 2D analysis type I must draw in just only one plane  (X-Y plane). In my case study I assume that the crack will propagate in plate and stiffener together, so I have to model a crack on the stiffener which I can't do if I model the stiffener as a line body. To eliminate the problem  of modeling the crack on the stiffener I have to use 3D model. But When I use 3D I'll face the problem of creating the nodal named selection, because In 3D analysis the nodal named selection must be An edge at crack tip, but when I use shell element I have a point at crack tip 


      I read ANSYS help many times, but I didn't fine sol. for my problem   

    • David Weed
      Ansys Employee
    • Abdoon075
      Subscriber

      Mr. David thanks for your response 


      I do a fracture analysis by using 2D analysis type. 

    • Abdoon075
      Subscriber

      Does that mean shell element support the fracture analysis ???

    • peteroznewman
      Subscriber

      Shell elements do not support fracture analysis.

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