Application of Batch Meshing using Hypermesh

Objective:

Perform Batch-meshing on the following components with the given criteria and assign the non-linear material property Steel to them.

Quality Criteria:-

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
10	Tria %	10

Target Element Length = 5mm

Procedure & Results:

Before working on the model first create a new parameter and criteria files with target element size of 5 mm and quality criteria as discussed in objective section. Enable mid surface extraction to auto extract the midsurface of the components.

The paramters and criteria file can be created using Preferences -> Parameters/ Criteria -> make changes -> save as. It is shown in below figure

• Now create a material -> steel -> edit properties as shown in below figure
• 
• Also to assign non linear properties and thickness, create property and edit the panel as per below figure
• 

Part -1 Hood

• Select Radios profile while opening the hyperworks
• Import the file into hypermesh. There are 4 components. Inner, outer, latch and hinge reinforcements.
• Create duplicates of each one of them.
• Now hide all the surfaces expect inner duplicate. Go to 2D -> batch meshing / QI optmize -> select surface (displayed) -> select the previousy created parameters and criteria file -> mesh
• This will create an auto midsurface based on paramter files and perform automesh as per the constraints mentioned in criteria file.
• 
• Repeat the process for all remaining 3 components

• Check for mesh quality to see if any element is failing. If failing then optimize it using element optimmizing techniques

• Now assign the material and property created as per figure shown above to each individual mesh
• Edit the thickness in property to 1.2 for hinge and latch reinforcement and 0.75 for inner and outer reinforcements.

Part 2 - Fender

• Select Radios profile while opening the hyperworks
• Import the file into hypermesh.
• Create duplicates of the component present.
• Now hide all the surfaces expect inner duplicate. Go to 2D -> batch meshing / QI optmize -> select surface (displayed) -> select the previousy created parameters and criteria file -> mesh
• This will create an auto midsurface based on paramter files and perform automesh as per the constraints mentioned in criteria file.

• Check for mesh quality to see if any element is failing. If failing then optimize it using element optimmizing techniques

CONCLUSION:

The study help us understand a faster technique for meshing surfaces. Based on the method, following observation can be made:

• The techniques creates meshing in few minutes in contrast to hours in manual meshing
• It also upholds the quality criteria and provide and good quality mesh based on the criteria mentioned.
• But the main drawback is it is mainly suitable for simple geometry. For complex geometry, this technique may create unstructured mesh to satisfy quality criteria which is a bad practice and it doesn\'t follow a uniform mesh flow. So this requires extensive element optimization to improve mesh quality but selecting bad mesh and improving them, which creates a our task complicated.
• Thus although fast and simple, this method should be used conservatively for complex models.