Week - 4 - 2D meshing for Plastic components

2D MESHING FOR PLASTIC COMPONENT

AIM:

To Generate the mid surface for all the components after checking the geometrical errors and mesh the mid surface with the given element Quality criteria

GIVEN:

CAD MODEL:

BOTTLE CAP

QUALITY PARAMETERS:

S.No	Quality Criteria	Value
1	Target/Average length	1
2	Minimum Length	0.5
3	Maximum Length	3
4	Aspect	3
5	Warpage	15
6	Skewness	45
7	Jacobian	0.7
8	Minimum Quad Angle	45
9	Maximum Quad Angle	135
10	Minimum Tria Angle	30
11	Maximum Tria Angle	120
10	Tria Percentage	15

METHODOLOGY:

• Model has to be clear Topology errors.
• Extracting Midsurface.
• Thickness has be to assigned to each Midsurface with different value.
• Generating mesh with the given element length.
• Improve mesh flow as per given quality criteria.

PROCEDURE:

IMPORTING FILE:

• Import the give model Files ->open->Bottle Cap.Ansa

CHECK GEOMETRY:

• Check the geometry by selecting Tools_checks_geometry and clear the error

To clear these error we can go with Both manual and automatic fix,here I fixed with automatic Fix option.

GENERATE MIDSURFACE:

To generate midsurface we have to find the thickness of the model

Go to Utilities_Measure and select the two Points/Nodes.

All the different thickness ha been measured and ready for the midsurface

• Midsurface are done in two different way based on the shape of the model
• Offset and middle tool in Faces are used

To get a mid between the rib first we have to remove the fillet with small distance

For that we are using Dach in Faces

After remove Middle curve have been taken and projected that curve line to perpendicular midsurface to create a new midsurface of Rib

Midsurface of various thickness are shown below:

PROPERTIES FOR THE DIFFERENT THICKNESS:

MIDSURFACE WITH PROPERTY GIVEN ARE SHOWN BELOW:

• Before mesh clean the geometry by topocleanup and cut option to get a better meshing
• Input the quality creteria value by pressing F11 and enter the given numbers.
• Enter the mesh parameter as per given target element length
• Go to modules_Mesh generations_Best and start meshing each surface

MESH ELEMENT AND ITS FAILURE:

To clear the failure and to get proper mesh flow we can use the following methods:

• RECONSTRUCT on FEM.To apply this select Modules buttons_Shell mesh_Reconstruct
• SMOOTH on element.To apply this select Modules buttons_Shell mesh_smooth
• SPLIT AND SWAP on element.To apply this select Modules buttons_Elements_Split/Swap
• EDGE2PARAMETERS on macros.To apply this select Modules buttons_Macros_Edge2parameters
• Increase or decrease the node numbers.To apply this select Modules buttons_perimeters_Number/num+/-

FAILURE:

REASON:

• When there is triple cons interacting each other failure will happen

FINAL OUTPUT:

LEARNING OUTCOMES:

At the end of this challenge I can able to:

• Perform geometry cleanup for any Plastic component.
• Generate Midsurface manually without using automidsurface.
• Generate shell Mesh for any Plastic component and knowledge of quality creteria.
• Identify quality failure and clear the failure and improve the mesh quality.

CONCLUSION:

Hence the geometrical error and mesh has been performed successfully.The thickness has to be generate after meshing.Quality failure are cleared and also got a proper mesh flow with low trias.