Hi,
Iam not able to import the step file. If I import the file we get errors.
Any idea what is wrong please.
Disable Tools → Settings → General → Split periodic faces and it should import this file correctly.
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one more issue it seems Prepomax has started to crash frequently please.
What version of PrePoMax and operating system ? When does it occur - when doing something specific or in different situations ? I haven’t noticed anything like that recently. It might be caused by something on your machine, maybe even antivirus.
we are using v2.4.0. Normally it happens when we import the file or when we generate the mesh.
We are on Windows 11.
It’s possible it was the default of the “Split periodic faces” setting, let’s see how it works with it disabled.
It works ok now.
Thx
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Nice model! I suggest you work with shell elements, and add the steel sheet plates supports of the frame for more realistic boundary condition application (or at least split the faces in FreeCAD). Prepomax meshing capabilities surprisse me everyday!
Thank you. We will build the complete frame and I will share the same.
*ERROR in e_c3d: nonpositive jacobian
determinant in element 18207*ERROR in e_c3d: nonpositive jacobian
determinant in element 18207*ERROR in e_c3d: nonpositive jacobian
determinant in element 18207*ERROR in e_c3d: nonpositive jacobian
determinant in element 18313
Negative jacobian = mesh issue
Here 2 elements at least are not correct (see screenshot), so redo the mesh
Note your model as well as the laods are symmetric: i would use half of the frame
You have negative jacobian errors and n element set is created with those elements:
Try with Shell Gmsh. Triangles will work, but it’s better to use quads.
I have meshed your model yesterday succefuly with these parameters and section definition:
There are two small surfaces in that area that would be better for meshing if they can be removed in CAD before exporting, anyway the mesher and solver have dealed with them succesfully. Whit that simple parameters the elements get very well formed and the element count is not so high.
You mention that you want to use simmetry, but there are some concerns in CalculiX that make it prone to bad results with curved shells and symmetry, so my advice is use the full model with shells, or use hexa elements if you want simmetry.
Feel free to contact me if you need support for solving your model.
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