How to achieve this mesh?

Fabricio.UrquhartFabricio.Urquhart Rio de JaneiroMember

Hello Peter,

 

I need a help for meshing point of stress concentration, like holes in plates. I have read a thesis work, like the picture below, but I could not do the same mesh. Do you know which method is possible to mesh like de picture?

Comments

  • peteroznewmanpeteroznewman Member
    edited April 2018

    Hello Fabricio,

    ANSYS has mesh controls that can provide a similar mesh. There is a mesh control called inflation that will put a layer of small elements around (or along) a boundary.

    If you create the geometry and attach it to your reply, I can show you these mesh controls.

    Regards
    Peter

  • raul.raghavraul.raghav Bethlehem, PAMember
    edited April 2018

    Peter is right about the inflation layer. Attached is a workbench archive file which shows two different ways of meshing the geometry.

    Refer to the pictures below. The first one is similar to the one you needed help with and the second one is a very easy way of meshing the geometry without any modification to the geometry but with inflation around the holes.

  • Raef.KobeissiRaef.Kobeissi United KingdomMember
    edited May 2018

    You can also use the Cut Cell method to apply a hexahedral mesh. I think ANSYS meshing tool would usually impose a hexa-dominant mesh for simple geometries like this one. 

  • Fabricio.UrquhartFabricio.Urquhart Rio de JaneiroMember
    edited May 2018

    @raul.raghav

    Can you attach a Ansys 18.2 file?The beam and the end-plate have different materials (A572 and A36). So I do not know how I match the node between different bodies with bonded contact.

    Thank you. 

     

     

  • Fabricio.UrquhartFabricio.Urquhart Rio de JaneiroMember
    edited May 2018

    Raef, the Cut Cell method is only to CFD analyse, isn't it?

  • raul.raghavraul.raghav Bethlehem, PAMember
    edited May 2018

    Fabricio, its a little more complicated to make the mesh conformal with multiple bodies as you want it. I've attached the workbench file showing you the steps and a pdf file which will walk you through the steps I performed to get a conformal mesh in the multiple bodies. The final mesh looks like:

  • Fabricio.UrquhartFabricio.Urquhart Rio de JaneiroMember
    edited June 2018

    Raul, I reached a good mesh dividing the edges and some faces. So the geometry is simpler. And I think that it is not necessary to use "node merge" between the contact, I asked it for Peter, He said it. And results are becoming better. See what happen if I use the node merge.

    What do you think about the mesh, In this exactly moment I am doing the convergence test, saving four or five model, increasing the number of nodes and mesh quality.

     

    Thank you very much!!!!

  • peteroznewmanpeteroznewman Member
    edited June 2018

    Fabricio,

    I would divide the face on the base plate along the three planes of the beam that you want to represent as welded to the base plate, then use Node Merge. On other models, I have even created triangular solids to represent the weld bead and bonded that extra material to the model.

    Regards,
    Peter

  • raul.raghavraul.raghav Bethlehem, PAMember
    edited June 2018

    Fabricio, node merge is important if you want a conformal mesh between the bodies. Without node merge the nodes of the bodies are free to move. Although they might appear conformal with uniform setting of "Multizone", they won't have conformity unless you use node merge. Again the requirement depends on what you're trying to model.

  • Fabricio.UrquhartFabricio.Urquhart Rio de JaneiroMember
    edited June 2018

    Thank you!

    I will try it, divide the base plate along the three planes. Yes, I thought about modelling the weld, but for this master thesis I will not do it yet.

     

    Thank you again!!!

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