Week 6-Meshing of Hood Challenge

AIM:

Aim to Generate Mid-Surface, Create Mesh and Run Quality Checks on Hood Model

Procedure:

1. opening .stp file
2. Creating Mid-Surfaces
3. Assigning Properties w.r.t Thickness of Different Parts
4. Giving Quality Criteria
5. Generating Mesh
6. Improving Quality of Mesh
7. Perform Quality Checks

1- Opening .stp file:

• Given File is in .stp Format
• 
• Select STEP from list and select model
• click on import
• Different Views of Model
• 
• 
• Change color of Model Parts
• 
• 

2-Creating Mid-Surfaces:

• To Generate Mid-Surface use tool Geom->MidSurface
• 
• select auto midsurface->auto-extraction->surfs->Displayed->Extract
• 
• Generated Mid-Surface Successfully and can be viewed in red Color in below image
• 
• Repeat the same Procedure for other parts
• Run Auto Cleanup on Extracted Mid-Surface using Geom->Autocleanup Tool
• 
• Select Surface->Displayed->Autocleanup
• While Extracting Mid Surfaces, sometimes Geometrical errors were found
• with this HyperMesh will try to clean Geometrical errors in Mid Surface
• 
• Repeat same process for remaining parts.

3-Assigning Properties w.r.t Thickness of Different Parts:

• Before assigning property to any component, first we need to calculate thickness of part
• now use Tool Geom->Distance->two points->select two points to calculate thickness of any part
• 
• here in this case thickness is 0.75mm
• Now Right Mouse Click on Menu tab to create new property
• 
• Now Assign Thickness to newly created property
• 
• Now assign The same property to component
• To Assign Property select Component
• New Tab will PopUp in Status Bar Area
• click on property and select property from property Tab
• Below Image can refer
• 
• Repeat same process for remaining parts

4-Giving Quality Criteria:

• Now before going for meshing we need to give some Quality criteria to HyperMesh
• To apply Quality Criteria go to Title bar->Preferences->Criteria File Settings
• 
• Enter Required values and save the Criteria file for future use
• click on apply
• 

5&6-Generating Mesh & Improving Quality of Mesh:

• Now to Generate Mesh consider only Mid-Surface
• Mesh should be generated on Mid-Surface
• To Mesh consider part and use Tool 2D->AutoMesh
• 
• Select surface and Click on Mesh
• Mesh will be Generated Shown Below
• 
• To Improve Mesh Quality use tools
• a-2D->Quality Index->Cleanup Tools
• 
• b-2D->Rebuild Mesh>Select Elements and click on Rebuild
• 
• Our Mesh Should Pass all Quality and there should be no Failing Quality Elements
• Images of Parts After mesh
• Outer extract
• 
• Inner Extract
• 
• Hinge reinforcement extract
• 
• Latch reinforcement extract
• 

7-Perform Quality Checks:

1. Check for free edges using tool

• Tool->Edges->Elements->all->Find Edges
• 
• there should be no free edges in between elements
• 
• Repeat same for remaining parts

b.Check for Normals:

• Use Tool
• Tool->Normals->Elems->Select all Elems->Display
• 
• all the elements on surface side should be in same color
• if some elements found different color on same plane select that elements and make them reverse
• 

c-Elements to Surface Check:

• From Title Bar Mesh->Check->Elements->Comparision->Select Elems and Surfaces with Tolerance of 1
• 
• 
• Yellow_Pink_Green is Fine
• but there should be no red color elements
• 
• Repeat same for remaining Parts

Learning Outcomes:

• Learned how to generate mid-surface
• Learned how to generate mesh on mid-surface
• Learned how to assign property with thickness to mid-surface and mesh
• Learned how to perform several checks on meshed parts

Final Model Images: