Tetra mesh for Housing model
Model 1
Objective : To create Tetra mesh for Housing model according to given element criteria.
Criteria : Elements sizes: Min- 2mm, Target- 5mm,Max- 7mm; Tet collapse: 0.15
Procedure :
1. Open a new RADIOSS format file in Hypermesh and import the housing CAD model.
2. Delete all the solids from the components, further check geometry for surface defects, fillets and other features with radius less than target element size and defeture as required using quick geometry and defeature tabs.
3. Mesh the two different models seperately. First using 2D tab, automesh the model with trias only element according to given quality criteria.
4. Check the mesh for the failed elements using check elements tab, rectify and cleanup using cleanup tools.
5. After successful creation of 2D shell elements. Using 3D tab, create tertramesh using the tetramesh option and selecting the 2D shell elements. Repeat the process for second component also.
6. Check for the tet collapase (defect generated when the height of tetrahedron 3D element is less/more than target element length). Tet collapse defect were cleared by re-meshing the elements and changing the height of tetra elements by translating nodes.
Note: Tetra remesh option could also be used by assigning the parameters of tetra mesh in the tertamesh tab of 3D section.
7. All the tet collapse cannot be cleared because it can affect the arrangement of tetra elements in a 3D mesh.
Result :
Housing CAD model
Housing after defeaturing
Housing after 2D meshing
Hub after defeaturing
Hub after 2D meshing
Housing and Hub After 3D Tetra meshing
(Section View)
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Model 2
Objective : To create Tetra mesh for Crank Hub model
Procedure :
1. Open a new RADIOSS format file in Hypermesh and import the Crank Hub model.
2. Delete all the solids from the components. Further, using the utility option open the quick tetramesh tab. Select the component, and confirm thr mesh size as 6 and the mesh style as trias only. Click on the mesh tab to create the tetra mesh.
3. Check for the tet collapase (defect generated when the height of tetrahedron 3D element is less/more than target element length). Tet collapse defect were cleared by re-meshing the elements and changing the height of tetra elements by translating nodes.
Note: Tetra remesh option could also be used by assigning the parameters of tetra mesh in the tertamesh tab of 3D section.
4. All the tet collapse cannot be cleared because it can affect the arrangement of tetra elements in a 3D mesh.
Result :
Crank Hub CAD Model
Crank Hub After 3D Tetra meshing
(Cut Section View)
(Full View)
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Model 3
Objective : To create Tetra mesh for Chasis Assembly model
Procedure :
1. Open a new RADIOSS format file in Hypermesh and import the Crank Hub model.
METHOD 1:
2. Delete all the solids from the components. Furthermore, using the utility option open the quick tetramesh tab. Select the component, and confirm thr mesh size as 6 and the mesh style as trias only. Click on the mesh tab to create the tetra mesh.
METHOD 2:
2. Also, if the model has solid elements, we can use the Volume tetramesh option to mesh each component seperately using the target length as 6 mm.
3. Check for the tet collapase (defect generated when the height of tetrahedron 3D element is less/more than target element length). Tet collapse defect were cleared by re-meshing the elements and changing the height of tetra elements by translating nodes.
Note: Tetra remesh option could also be used by assigning the parameters of tetra mesh in the tertamesh tab of 3D section.
4. All the tet collapse cannot be cleared because it can affect the arrangement of tetra elements in a 3D mesh.
Result :
Chasis Assembly CAD Model
Chasis Assembly After 3D Tetra meshing
Section View (Half Assembly)
Full View (Half Assembly)
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Conclusion:
We have learned three different methods for 3D tetra meshing for the solid components.
Link for the Files and Models : https://drive.google.com/file/d/1zHgbl9QUqB_nR7hpb3Quq64zr5QDgdJt/view?usp=sharing