# Guarantee mesh continuity between two solid bodies

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Hi All

I know that in shell structures, when we have the midsurface, we verify that there are no free edges, what about two solid bodies, specially if I have had to trim the solid, since a part is revolutio and the other part is an extrusion, so they might need different meshing techniques ? how can I assure the mesh in continuous ?

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Hi,

Using replace panel or using free edges panel user has to equivalence the nodes thereby connectivity can be maintained.

I recommend you to go through Practical Aspects of Finite Element Simulation (A Study Guide) ebook where this concept is covered (from page 248 onwards).

Also, please go through https://www.youtube.com/watch?v=aktDBNgb1-w (4 video parts are available) where maintaining connectivity is shown.

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Thank you very much, But one question remains : How do I make sure, that after meshing, the mesh in the comon surfaces is connected? I see that sometimes Hypermesh applies slightly different mesh or nodes on two identical edge, or surfaces

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Hello,

This can be made sure by using the option keep connectivity while meshing the surface or this can also be made sure by using Edges panel available in the Tool page. There you can select the elements, provide the required tolerance and click on preview equivalence, this will highlight the nodes which need to be equivalenced and when you click on the Equivalence button it will join them. You can do some trials by increasing the tolerance. But make sure you don't provide the tolerance which will distort the entire mesh.

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Thank you for your answer, could you give me a screenshot of that tab ? I don't see the keep connectivity, also when choosing edges , it says that the biggest displacement was 0.03 , does it mean the mesh is connected ?

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The keep connectivity option comes while meshing the surface (refer below image). The biggest displacement value shown represents the largest distance there is between two free nodes which means you need to increase to tolerance to that value to correctly equivalence the nodes.

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