2 Replies Latest reply on Feb 17, 2014 1:16 PM by Shaun Densberger

    High Stresses at Joints

    Lakhvinder Singh

      Hi All,

       

      I am doing a simulation and the stresses are really high on the corners where two tubes meet. Please see attached. This will ofcourse not be in reality, as the gap between the tubes will be filled up by welds.

      I know the reason is due to the geometry. Is there any way we can remove these hot spots? Otherwise I will have to extrude the tubes (with the feature option "up to body"), which will make a fully enclosed joint. But then I cannot use that model for generating my drawings. Is there a better way so that these hot sopts don't come up?

       

      Regards,

       

      LS

        • Re: High Stresses at Joints
          Jared Conway

          components that don't touch can't have their nodes merged and therefore can generate high stresses because htey are bonded with rigid beams

          make a configuration specifically for simulation where they are touching. this is sometimes something you have to do.

          • Re: High Stresses at Joints
            Shaun Densberger

            Even if you extended the geometry, you could still have high stress areas, which may or may not be realistic. Very sharp corners result in singularties, were the stress will continue to increase (i.e. not converge) as your refine the mesh. The best way to handle this is to refine the mesh enough so that the singular elements are well within the weld region, and then look at the stresses outside of the weld region. You're using Saint-Venant's Principle to argue that failure outside of the weld region will not happen.