Hi all, I am new to ABAQUS CAE and is trying to seek help in RG with regard to my research project.
I am trying to mesh a marine stabilizing fin (Basically a tapered plate with hinges-solid) and Abaqus prompted me with the following warning 'The selected regions cannot be meshed automatically using the assigned element shaped. They must either be partitioned, assigned a tet shape, or manually meshed using the Create Bottom-Up Mesh tool.'
I was using S4R element for the ship shell, and i have tried other elements and it doesnt work. Can someone please advise? Thank you.
The part is attached if it helps. It is drawn using autocad 3D and export to abaqus as a part
Hi,
As the error message tells, for complex geometries you must help the software (Abaqus) by creating partitions for your components. After this you will be able to mesh it.
To create partitions for shell elements (S4R) go to the Mesh module (as illustrated in the attached picture) and click & hold the button in the red circle 1 to partition your component. You will then have multiple options to create your partitions, for example. between two points. (If you want to create partitions for solid (3d) elements you should click&hold the next button placed below).
After that, if the quadratic finite elements are not adequate, you can change the shape of your finite elements by clicking the button indicated by the red circle 2.
Good luck
Hi,
As the error message tells, for complex geometries you must help the software (Abaqus) by creating partitions for your components. After this you will be able to mesh it.
To create partitions for shell elements (S4R) go to the Mesh module (as illustrated in the attached picture) and click & hold the button in the red circle 1 to partition your component. You will then have multiple options to create your partitions, for example. between two points. (If you want to create partitions for solid (3d) elements you should click&hold the next button placed below).
After that, if the quadratic finite elements are not adequate, you can change the shape of your finite elements by clicking the button indicated by the red circle 2.
Good luck
Thank you for your comprehensive guide, sir! I will now try to partition it before meshing again.
Update: I have created some datums to help me with the partitioning. Do I have to partition them into a face or cell for a solid?
Partition Face can be used for shell elements, while the Partition Cell option is suitable for solid (3d) components.
Noted, thanks.
Following your recommedation, i can finally mesh the solid but with quadratic tet, type C3D10 (3D stress), thank you. I am curious if this would affect the accuracy of the results as the rest of model is meshed with S4R element? And also, I kept the mesh size the same for both elements.
Hi, I'm glad that my answer was helpful.
In theory, all elements have a 3D geometric representation. So, if you use solid finite elements (like C3D10) you can obtain accurate results. The S4R elements, are bi-dimensional finie elements.
Good luck!
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