General Mechanical

General Mechanical

Analyzing Edges, Break Sharp Edges?

    • albin.linderstam
      Subscriber

      Hello,

      I'm trying to analyze a part which consists of sharp edges. I wonder if there are any tips how to analyze parts that consist of sharp edges?

      If I should include sharp edges in my analysis but simply neglect the results in those areas or if I should replace the edges with fillets (more elements)? In reality, we always break edges 0.1-0.3mm.

      A little example to help with discussion.

      1. Initial approach with sharp edges:

    • TomPhemmy
      Subscriber
      Since you have a sharp corner in your model, you will have stresses that continue to increase with mesh refinement; the stresses at corner is in theory infinite in an elastic analysis. One option is to add a fillet to the sharp corner which is what you have done. Another option is to ignore the stress at this location and check convergence at a location some distance from the peak stress. This kind of stress singularity usually have an asymptotic value at some distance from the singularity that will remain the same if your stresses have converged. A third approach is to use a plastic material properties to help the redistribute the stresses locally.
      In your case, adding fillets has worked which is what the object looks like in reality. I think you have arrived at your solution
    • albin.linderstam
      Subscriber
      Hello again, regarding "ignore the stress at this location", is there a way to ignore these stresses by the program itself? Let say I have 1500MPa at an edge and the rest is mainly around 300-800, it can be hard to find/see the second highest stress location. So I wonder if I can make Ansys ignore this edge as well so I can more easily find the other critical and more realistic locations?
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