Create 3D mesh using Hypermesh

Objective - To create 3D mesh for the models provided in the challenge according to the parameters mentioned.

3D Meshing: Tet Collapse : 0.15

• Create Tetra for Housing model

Elements Sizes: Min - 2mm, Target - 5mm, Max - 7mm

• For the give two model

Create 3D mesh with 6mm

Procedure -

Housing - Create Tetra for Housing model

Elements Sizes: Min - 2mm, Target - 5mm, Max - 7mm

• Open Hypermesh and import the .stp file and open it.
• We have housing model which contains two components cover and hub.

• Now hide the hub and make cover as a current component.
• Then clean up geometry using quick edit and other option in geometry panel.

• Now go to 2D panel and click on automesh and mesh with the criteria of target element size of 5mm with trias and automesh the component.

• After that check for the quality index with element of min size 2mm and max size 7mm.

• Now for tetramesh go to 3D panel and click on the tetramesh and select elements and click on mesh.

• After that check for the tet collapse. For this first click on the tool panel and click on check elements and select 3D and check for the tet collapse.

• If there any tet collapse rectify them using different option in 3D panel.
• For checking if tertamesh is created or not, click on the mask option mask some elements and check for the tetra mesh. Below a pic of tetramesh created on cover.

• Now make hub as a current component and hide cover.
• Then delete the solid part.
• Then clean up geometry using quick edit and other option in geometry panel.

• Now go to 2D panel and click on automesh and mesh with the criteria of target element size of 5mm with trias and automesh the component.

• After that check for the quality index with element of min size 2mm and max size 7mm.

• Now for tetramesh go to 3D panel and click on the tetramesh and select elements and click on mesh.

• After that check for the tet collapse. For this first click on the tool panel and click on check elements and select 3D and check for the tet collapse.

• If there any tet collapse rectify them using different option in 3D panel.
• For checking if tertamesh is created or not, click on the mask option mask some elements and check for the tetra mesh. Below a pic of tetramesh created on hub.

Result - Created a 3D mesh for housing for given quality criteria of target element size of 5mm and min of 2mm and max of 7mm and tet collapse of 0.15

• Create 3D mesh for given two models with element size of 6mm and tet collapse of 0.15
1. Crank Housing
2. Chassis assembly

Crank Housing -

• Open .hm file in Hypermesh i.e. crank housing.

• Clean up geometry using quick edit and other option in geometry panel.
• Now go to 2D panel and click on automesh and mesh with the criteria of target element size of 6mm with trias and automesh the component.

• Check for the 2D mesh quality.

• Now for tetramesh go to 3D panel and click on the tetramesh and select elements and click on mesh.

• After that check for the tet collapse. For this first click on the tool panel and click on check elements and select 3D and check for the tet collapse.

• If there any tet collapse rectify them using different option in 3D panel.
• For checking if tertamesh is created or not, click on the mask option mask some elements and check for the tetra mesh.

Result - Created a 3D mesh for crank housing for given quality criteria of element size of 6mm and tet collapse of 0.15

Chassis assembly -

• Open .hm file in Hypermesh i.e. chassis assembly.
• When model is load there is intersection, first we have to rectify that intersection using translate option in the tool panel.

Part 1 - Hub

• Make the hub component as current component and hide other component.
• Clean up the geometry using quick edit and defature option in geometry panel.

• For the hub component, the splines and the teeth and fillets with a radius of less than 15 are removed. So, that mesh can be generated properly.

• Cleaned hub geometry.

• Now go to 2D panel and click on automesh and mesh with the criteria of target element size of 6mm with trias and automesh the component.

• Now for tetramesh go to 3D panel and click on the tetramesh and select elements and click on mesh.

• After that check for the tet collapse. For this first click on the tool panel and click on check elements and select 3D and check for the tet collapse.

• If there any tet collapse rectify them using different option in 3D panel.
• For checking if tertamesh is created or not, click on the mask option mask some elements and check for the tetra mesh. Below a pic of tetramesh created on chassis hub.

Part 2 - Other component

• Make arm part of other component as current component.
• Then, for this and other remaining component we use the different option for tetramesh.
• Go to view click on browsers then hypermesh and then open utility.

• Then a utility window open click on Geom/mesh and then Quick TetraMesh. A new window open named as quick tetra.

• In Quick Tetra select component, and element size of 6mm and elements as tria. Click on mesh.

• 3D tetramesh created

• After that check for the tet collapse. For this first click on the tool panel and click on check elements and select 3D and check for the tet collapse.

• Similarly done same for other two components and create tetramesh for them too and check for the tet collapse.
• As we see in chassis assembly model, it is identically the same on both sides, first complete the tetramesh on left side and then reflect the whole on the right side.
• For reflect click on tool and click on the reflect tab and reflect the left to the right side.
• For checking if tertamesh is created or not, click on the mask option mask some elements and check for the tetra mesh.

Result - Created a 3D mesh for crank housing for given quality criteria of element size of 6mm and tet collapse of 0.15.

Conclusion -

In the challenge learnt about the tetramesh or 3D mesh and check the tet collapse.

• For housing model, 3D mesh is created with target element size 5mm with min 2mm and max 7mm.
• For other two model, crank housing and chassis assembly 3D mesh created with element size of 6mm.
• Tet collapse of 0.15 is used for all models.