Week 4- Meshing of Backdoor Challenge
AIM: In this challenge, follow the below mentioned quality criteria and mesh the given backdoor geometry of a car component.
GIVEN:
S. No. Quality Criteria Value
1 Target/Average Length 5
2 Aspect Ratio 5
3 Skewness 45
4 Warpage 15
5 Taper 0.5
6 Minimum Length 3
7 Maximum Length 7
8 Minimum Quad Angle 45
9 Maximum Quad Angle 135
10 Minimum Tria Angle 30
11 Maximum Tria Angle 110
12 Tria Percentage 15
OBJECTIVE: The objective of this challenge is to perform the geometric cleanup and extract the mid surface of the given backdoor geometry of a car and then mesh this components following the given Quality Criteria using hypermesh software.
PROCEDURE:
<!-- [if !supportLists]-->1. <!--[endif]-->Firstly import the model in hypermesh software and open it following the given steps: Go to Import geometry and select the file type as ‘iges’. Then choose the file and click on import option. The model gets open in the software.
2. In this component, there are three different parts present. So select each part one by one for meshing and follow the steps given below.
<!-- [if !supportLists]-->3. After opening the model, check the model, if any solids present in it. If any solids present in the component, then we have to delete them. For that go to Delete>solids and select the component and click on delete.
<!-- [if !supportLists]-->4. Now to perform geometry cleanup, go to the Geometry> autocleanup option and select the model and press middle mouse button. Autocleanup option automatically clear geometrical errors present in the model.
<!-- [if !supportLists]-->5. After geometry cleanup, we proceed for midsurface extraction. For that go to Geometry>midsurface option. Choose the auto midsurface option and select all the surfaces. Then click on extract option.
Midsurface gets created as follows:
<!-- [if !supportLists]-->6. Then assign the material and properties to the midsurfaces of the component. Also assign thickness to it.
<!-- [if !supportLists]-->7. Now create washer splits around all the holes.
<!-- [if !supportLists]-->8. Now proceed for meshing the component. Here meshing will be done by following the steps given below: Go to 2D> automesh option and enter the given element size as 5 units. Then choose the mesh type as ‘mixed’ and select all the surfaces one by one. Then execute the meshing by clicking on mesh option.
<!-- [if !supportLists]-->9. After mesh is generated on the component , assign the given quality criteria by going to the Tools>check elems>settings>Criteria editor and enter the given quality criteria and apply.
10. <!--[endif]-->Then refine the mesh by using cleanup tools option present in the quality index section.
11. <!--[endif]-->Make sure that there are less rotating quads and opposite trias present in the model. Reduce trias near to free edge or holes or on the fillets. OFF elements must be zero after giving quality criteria.
<!-- [if !supportLists]-->12. After that, smooth option is used to get good quality mesh flow.
Final model image:
LEARNING OUTCOMES:
1) Performing this challenge enables to use different tools in the software.
2) Learn geometry cleanup technique.
3) Learn to extract the midsurface by auto midsurface technique.
4) Knowing how to use different tools to get good quality mesh.
CONCLUSION: After performing proper geometrical cleanup and extraction of midsurface for the component, the given backdoor geometry of a car is meshed according to the given quality criteria.
Model Link:
file://DESKTOP-HO73RMC/Users/Shree/Documents/Hypermesh/challenge 6/challenge 6.hm