Week 6-Meshing of Hood Challenge

Assignment-5: Week 6

Objective: To mesh the car hood with mesh criteria as below

Procedure:

• Upon importing the hood.hm model, we can see that it consists of four different parts
  • Inner Extract
  • Outer Extract
  • Hinge Reinforcement
  • Latch Reinforcement
• All these parts need to be individually meshed and placed in different components so that we can assign respective material properties and thickness

Meshing Inner Extract

• To start working on inner extract, isolate inner extract component so that all the rest are hidden
• Next extract the mid-surfaces for the component and rename the it with suitable name
• It can be seen that there are many unnecessary edges on the model
• Geometric cleanup is done to toggle all the unnecessary edges, unnecessary points are suppressed, washer splits are created around holes are other features

• Before starting the mesh ensure there are no free edges
• Once geometry cleanup is done, then start meshing the component
• Use mixed mesh with element size of 5 units
• To start with meshing, start from the outer surfaces and then move towards inner surfaces for meshing

• To improve the quality use optimize elements, smooth elements, move trias in quality index panel
• Further mesh can be improvised by using align nodes, associating nodes with edges, moving nodes etc
• Ensure all the mesh quality criterias are satisfied
• The tria elements are 5.6%

Meshing Outer Extract

• Isolate the outer extract component, extract mid-surface and rename the mid surface component
• Ensure there are no free edges on the component
• The unnecessary edges on the mid surface needs to be toggled.
• 
• For better mesh control to get maximum quad elements split the surfaces in rectangular blocks
• Mesh the component with same parameters as used for meshing on inner extract

• It can be seen that the mesh satisfies all the quality criteria
• Total tria elements are 0.89%

Meshing Hinge Reinforcement

• Hinge Reinforcement contains to mirror-symmetry components
• Extract mid-surface for one of the component.
• The mid-surfaces need to be then splitted in rectangular blocks to get good mesh
• Create washer split around the cutouts

• The component is the meshed to obtain mesh as below

• Total number of triangular elements are 3.5%
• Reflect mesh option can be then used to create the mesh for other symmetric component

Meshing Latch Reinforcement

• Extract mid-surfaces of latch reinforcement component
• Toggle the unnecessary edges
• Split the geometry into appropriate block

• Upon meshing the component with 5 unit as an element size. The mesh obtained is as below:

• Total tria elements are 2.5%