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Mapped Mesh doesn't work on a very simple part

drush
4-Participant

Mapped Mesh doesn't work on a very simple part

Creo 9.0.7.0. T5 license

I'm trying to create a mapped mesh on very simple shape.  But when I try to create the mesh it fails to make bricks and reverts to tets.  I've spent a lot of time trying to do this very simple task and I am frustrated.

drush_0-1711410737667.pngdrush_1-1711410847440.png

My geometry an extruded sketch.  It has (or had) some fillets on the vertical edges but I have suppressed them. I have selected every surface combination possible (there are 3 possibilities - top+bottom, the two sides, and the ID and OD).

 

 

5 REPLIES 5
skunks
18-Opal
(To:drush)

I only have Creo Simulate Advanced 2 ( or 3).
Here is my model in Creo 2, does it work for you?

cone.png

drush
4-Participant
(To:skunks)

Thank you Skunks.  Your geometry was more complex than mine (you made a cone and I made a section of a cylinder) and you helped me think things through. 

 

The problem is that I applied a load using the "total load at point" option .  Which appears to be the only way to apply a force in a cylindrical coordinate system such that it can be analyzed using non-linear analysis.  My attempts to work around this problem have failed, but when I suppress this load it meshes.  Which makes sense - the mesher wants to put a node where I applied the force, but I randomly selected the point and it is not associated with any geometry and is not where a node is created by the mesher, so it creates a meshing conflict. I have since created a datum point (and a simulation point) in the geometric center of the face hoping that if the datum point was at the location of a node mapped meshing would work, but it doesn't.  I have determined why mapped meshing didn't work, but I have yet to overcoming the challenge of applying a load to the face (in a cylindrical coordinate system) so I can run the model non-linear.

 

This is preventing me from map meshing bricks:

drush_0-1711470022233.png

 

skunks
18-Opal
(To:drush)

..."total load at point"...

For "total load at point", I would click on a corner point.

 

PS: example attached

drush
4-Participant
(To:skunks)

Thanks again Skunks.  I gave up on the mapped mesh, turned my point in the middle of the face into a hardpoint, and set a maximum element size.  This resulted in a higher density tet mesh, applied the force evenly to the surface, and eliminated my buckling problem, which was occurring due to a bad element shape. However; I do like your meshing approach better than the approach I used so I may give it a try.

 

I am trying to model an elastomer with a modulus of 1 MPa.  Modeling an elastomer has many challenges.  I solved the buckling problem due to the element shape, but more buckling problems exist at higher loads and these are due to boundary conditions.  If I could create a constraint which sets displacements on a surface equal, but not a prescribed amount of displacement (I am applying a force to these surfaces), I could create realistic boundary conditions. To my knowledge this is not possible, so I believe I must model and simulate an assembly.  I may also need to use a hyperelastic material model.  I was hoping I could keep my analysis simple but the complexity is increasing.

Hello @drush

 

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