Week 6- Challenge

AIM:

To perform meshing for the given component with a mentioned quality criteria, and assign thickness.

METHODOLOGY:

METHODOLOGY TO CLEAN UP GEOMETRY OF THE FOLLOWING COMPONENT (HOOD).

1. IMPORT MODEL
2. GEOMETRY CLEANUP
3. DELETE SOLIDS
4. EXTRACT MIDSURFACE
5. ASSIGNING QUALITY PARAMETERS
6. MESHING THE COMPONENT
7. ASSIGNING THICKNESS

PROCEDURE:

HOOD:

1. IMPORT MODEL:

• Import the given model into hypermesh.
• Importing model may not be possible if the file format is not supported by the hypermesh.

2. GEOMETRY CLEANUP:

• After importing the model the main process is geometry cleanup.
• In some cases if the model is imported to hypermesh due to some graphical issues the geometry changes may occur, So geometric cleanup plays an important role.
• Remove all unnecessary lines from the model.
• Check if any surface is missing or overlapped.
• If any surface is missing, create a new surface over there by using a surface tool or filler surf tool.
• If two surfaces are not stretched together then use a toggle edge tool to stretch together.
• By using the toggle edge tool the feature lines can be suppressed for the better mesh generation.

3.DELETING SOLIDS:

• Before generating 2D mesh for the components then the solids should be deleted.
• It can be done by using the delete tool and select solids and select all to delete all solids from the component.

4.GENERATING MIDSURFACE:

• For generating the midsurface the solids should be removed.
• Create washer splits near the holes for better mesh flow.
• By using a midsurface tool select surfaces and generate midsurface.

• Auto midsurface tool helps to generate midsurface with different conditions, they are

• Offset+planes+sweeps

• Offset+planes

• Offset

• Skin offset

• Here by using the skin offset tool the mid surface is extracted from the component
• Geometry cleanup should be done before meshing.
• Midsurface is extracted separately for inner and outer hood.

5.ASSIGNING QUALITY PARAMETERS:

• Assign the given quality parameters
• Target Element Length = 5mm

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

• After entering the values, apply and click ok .

6.MESHING THE COMPONENT:

• Mesh is done for inner and outer hood separately.
• If the component is in a symmetric shape then the meshing can be done very easily.
• Meshing is performed by using the AUTOMESH tool from 2D.
• The meshing should be in a good flow.
• By changing the nodes mesh flow can be adjusted and by using REBUILD MESH tool.
• By using the SMOOTH tool mesh flow can be smoothen.

• After finishing meshing go to QUALITY INDEX tool to know the failed elements.
• In a quality index tool the failed elements will be shown clearly and by using the tools present in the quality index failed elements can be corrected.

• Drag trias, combine trias, split quads, split/collapse edges, smooth, place node, element optimization, node optimization, modify hole and washer, swap edge by using all these tools mesh can be edited and can form into a good flow.

7.ASSIGNING THICKNESS:

• Before assigning the thickness, the property table should be created for two parts inner hood and outer hood separately.
• And also the material card is also required, create any material card if not mentioned any material.
• Assign the thickness for inner and outer hood.
• And assign the property for the midsurface and meshing.

• To view the component in thickness after meshing select 2D Detailed Element Representation.

LEARNING OUTCOMES:

• Geometry cleanup.
• Extracting midsurface.
• Assigning quality criteria.
• Meshing.

RESULT:

Meshing for the given component with a mentioned quality criteria, and assigning thickness had done completely.