General Mechanical

General Mechanical

SIF of the element

    • momidor
      Subscriber

      Hi, 


      I'm  wonder whether is possible to obtain SIF ( stress intensification factor ) from the model somehow ?


      Regards

    • peteroznewman
      Subscriber

      Hi Mom,


      If you have a crack in your geometry, you can perform a Fracture Analysis on it.


      There is a whole section of the online help about how to do that.



      From your other post, I got the impression that the flaw in your solid model is more of a void than a crack. In that case, the Pre-Meshed Crack might work. That is where you use a named selection for the nodes that are on the crack front.


      You insert a Fracture into the model and a Fracture Tool in the Solution branch and request the SIFS result.



      Today I was playing with geometry to represent the air around an airfoil, so I re-purposed the geometry, assigned Structural Steel material property and defined a pre-meshed crack at the trailing edge. The bottom of the block is fixed and the top has an applied upward force. Here is the SIFS result from the Fracture Analysis.



      I found a YouTube video that shows some of these operations in ANSYS 14.5



       


      Cheers,
      Peter

    • momidor
      Subscriber

      Hi Peter, 


      Thanks a lot ! Look ideal but the obstacle is I don't have "Fracture" button under the command bar "Model" 


      Regards 


      Mom

    • peteroznewman
      Subscriber

      Hi Mom,


      A very simple way to think about this is to have two models: one with and one without the void.
      It is simple to delete the 6 faces of the void in DesignModeler to end up with a smooth surface.


      With the void, I got 643 MPa while without the void, I got 207 MPa, so you could estimate a stress concentration factor of 3.1



      Hope this helps. Others may want to comment.


      Cheers,
      Peter

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