Shell Meshing on an Automobile Hood using Hypermesh.

Week 6 Challenge

• Aim : To extract the mid surface and mesh the given model of an Automobile Hood.
  
  
  
  
  Initial Component as received.
  
  
  
  
  
  
  
  
• Procedure: 1. The very first step when we receive the model is to delete the solids present in it. To do this, I used the delete command (shortcut-F2) and used the solids option in it.
  
  
  
  
  Delete command
  
  
  
  
  
  2. After the deletion of the solids in the model, I then proceeded to extract the mid-surface of the various components present in the model. The first component is took the mid-surface for is the latch in the hood. To do this, I used the Mid-surface command in the Geometry tab and selected the surfaces present in the geometry of the latch.
  
  
  
  
  Mid-surface Command
  
  
  
  
  
  
  
  
  
  Latch Mid-surface
  
  
  
  
  
  
  
  3. I then proceeded to Perform the Geometric clean up on the mid-surface of the component. To do this, I firstly enabled the Display all points and measured the distance between the edges where I could see that the elements formed there will fail for minimum length criteria. After identifying a few edges, i removed them by using the toggle lines command which is present in the Quick Edit Tab (shortcut-F11). I then removed all the lines and made the necessary cuts on the mid-surface of the component.
  
  
  
  
  Toggle Lines
  
  
  
  
  4. After the Geometric Clean up was performed on the surfaces, I then went on to mesh the component. To do this, I used the Automesh command (shortcut-F12) in the Geometry tab. I then meshed all the various surfaces in the component part by part to achieve a better mesh flow.
  
  
  
  Auto Mesh command
  
  
  
  
  After Automeshing the mid-surface part by part, the component looked something like the following:
  
  
  
  
  
  Latch Mid-surface
  
  
  
  
  
  
  
  
  5. After Meshing the component, I then removed all the unnecessary tria elements from the mesh and also, cleared all the elements that were failing for different Quality criteria. To perform this, I used the quality criteria tab and removed all the tria elements and cleared all elements that were failing.
  
  
  
  
  
  Quality index
  
  
  
  
  
  
  
  
  
  
  6. I then followed the same procedure all the other components. All the Meshed components look something as
  
  
  a. Outer Extract:
  
  
  
  
  
  
  
  
  
  b. Inner Extract :
  
  
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  c. Both the Hinges:
  
  
  
  
  
  
  
  d. Latch :
  
  
  
  
  
  
  
  
  
  
  
  7. All the Elements have also cleared the Quality Criteria:
  
  
  
  
  
  Quality Criteria.
  
  
  
  
  
  
  
  
  
  
  All Components cleared the Quality Criteria
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
• Conclusion: In conclusion, I would like to state that, this model has helped me understand the various procedures and obstacles that can be faced when meshing a component. I also understood how to clear the Various Quaity Criterias by different methods.