Week 6- Challenge

Objective:

• To mesh given bumper hood cad model and apply mentioned quality criteria and assign thickness.
• Apply following mesh quality criteria and thickness value.

S.N	Quality Criteria	Value
1	Aspect Ratio	5
2	Skewness	45
3	Warping	15
4	Taper	0.5
5	Min. Length	2mm
6	Max. Length	8mm
7	Min angle Quad	45
8	Max angle Quad	135
9	Min angle Tria	20
10	Max angle Tria	120
11	Tria %	10

Procedure:

1) Import STP file of Hood in Hyper works using import Model option.

2) Delete all the solids in the model.

3) There are 4 components in Hood – a) Inner extract b) outer extract c) hinge reinforcement d) latch reinforcement.

4) Create midsurface of each component separately and rename them accordingly. Mesh is to be created using these midsurface. Perform Geometry clean-up on each of them

5) Set the quality criterion given in the above table in the hyper works.

Fig – Quality check

6) Create new component for each of the above parts and organize all midsurfaces in each of the components created.

7) Now select each component midsurface one by one and perform mesh.

8) As the model is symmetric in geometry and shape mesh only half part and reflect it in the other half.

9)

• As the geometry is complex, divide the geometry in the small compartments so as make the task easy. Also create washer around complex sections.
• Select each surface individually and perform mesh using following option
  2D -automesh-set element size=5-element type-quad (preferable)-select surface-mesh
• Repeat this process till all the surfaces are meshed.
• Now perform a quality check based on above table and try to remove error as much as
  possible.
• Check elements using Tools-check elements
• Different option that can be used are
  a) quality index-cleanup tools-element optimize/place nodes/smooth
  b) edit elements-combine/create/split
• Make note of element count and percentage of quad and trias present in the model.
• In the end check for free edges and equivalence.

10) The meshed model is as follows,

a) Inner extract body1:

b) Outer extract body1:

c)Hinge extract body1:

d) Latch reinforcement body:

e) Hinge extract body2:

Conclusion:

• Meshing is the primary and most important step of any problem solving in CAE.
• Hence the study helps us understand different technique and methods of performing 2D meshing andoptimizing it in detail.
• It also gives good understanding about different quality criteria and how to change them accordingly.

Google drive link:

https://drive.google.com/file/d/1K1doSPlgQIXgSlVYE7GiLX4TmEuprOf-/view?usp=sharing