I perform a nonlinear analysis of a curved circular tube.
I completed the preparation of the mesh with : Mesh control - size along curve.
When Femap generates a mesh, only 1 element is always generated along the tube thickness.
Even though I change the number of elements on the curves in the radial direction of the tube section.
When I use Meshing toolbox - Mesh sizing , the grid dimensions also do not change.
In my research, I need to perform analyzes with different sizes of the finite element grid.
Tell me which commands should I use here?
Try using the command Mesh > Editing > Edge Split
Select a node on the outer wall of the tube and then select a node on the inner wall of the tube. You can specify the number of splits you would like.
The reason of the meshing error is the underground geometry:
This is the true geometry that is really associated with the solid body & HEX mesh in your model, as you see not any radial curves exist, you have two options:
Simply using the MESHING TOOLBOX you can mesh the base surfaces with 2-D PLOT-ONLY elements, making sure the mesh quality is correct: use an element size of minimum 4/2=2.0, being 4 the wall thickness. Next extrude the 2-D mesh to create 3-D solid HEX8 elements using command MESH > SWEEP >CURVE and you are done!!
Well, previously prescribe the mesh size in the curve used to perform the mesh extrusion using an element size = 2.0.
The final step will be to associate the generated 3-D HEX mesh with the 3-D solid body, use command MODIFY > ASSOCIATIVITY > AUTOMATIC, the final result will be the same as using the general procedure of meshing a solid with HEX elements, but following the above method you have control of all steps, OK?
Best regards and good luck!,
Blas_Molero Thanks for the detailed answer.
But there is a small problem.
My body is a curve circular tube, so the GEOMETRY> SOLID> EXTRUDE command is not suitable. or I'm wrong?
so I do so:
1. create bondary surface and convert
In this case, I have coinciding curves. I can not delete them.
For comparison, the solid that was obtained with the help of commands GEOMETRY > SOLID > EXTRUDE - no problems
Then I use the command "Split point-to-Point" to split radially the tube. As seen below, these solids are different
Then I define the sizes of a grid Mesh-mesh control-size along curve
and I have problems with generation of a grid for sweeped solid
and one more question . Is everything right here?
if I use MESH > SWEEP >CURVE, I can get only plate elements.
probably correctly used MESH > SWEEP >ELEMENT?
Sorry, use MESH > SWEEP > ELEMENT, of course!.
Here the option of extrusion of a 2-D mesh is not possible, but please note you can use the general method of 3-D HEX meshing, not need to complicate things, this is a simply problem:
The result will be the following: please note the different number of divisions in the inner & outer circles, 41 & 47. To have a quality mesh simple change the number of elements in the circle edges to be the same, for instance 48 divisions.
Next use command MESH > GEOMETRY > HEX MESH SOLIDS and you are done, the mesh quality is perfect, all elements are HEX8:
I see you have defined a property named PLOT PLANAR PROPERTY, wrong!, this type of property is not necessary to define.