Week 6-Meshing of Hood Challenge

AIM : mesh the following components individually and follow the quality criteria of mesh as per given data.

OBJECTIVE :

• import the following geometry file and check for solid surfaces and geometrical erorrs.
• extract mid surface of each component individually and check for geometrical errors.
• meshing of the individual components one by one and follow the quality criteria.

GIVEN DATA:

The given data are the inputs to work. Here the given data are,

• CAD model.
• Quality criteria.

• CAD MODEL: Here the given cad model is sheet metal - Hood assembly consist of Latch, Hinges, Inner & outer hood panel (BIW components)

• QUALITY CRITERIA: Every product which is been produced will go through the set of quality check. If the quality check fails other steps like boundry condition & apllying loads will not be feasible, So for this reason the element quality check is performed. To identify the quality failure the quality criteria will be entered as an input data. The given quality criteria are shown in the below table. The elements should be maintained within the below given value. If the given quality value is not maintained there will be a failing in qulaity.

PROCEDURE:

1. Import CAD geometry.
2. Geometry cleanup.
3. Mid surface generation.
4. Shell or solid meshing.
5. Element quality check.
6. Mesh improvement.
7. Apply load & Boundry condition.
8. Export input file.

IMPORTING THE GEOMETRY FILE :

import> import model>browse file> select file>click on import botton

GEOMETRY CLEANUP

• To generate FEM we clean up the geometry.
• Surface patch up, creating new surfaces, eleminating of triple cons in unwanted area, converting single cons to double cons in necessary area are comes under geometry cleanup phase. HYPERMESH has some option to rebuilt the surfaces for some extent using auto clean-up option.

MID SURFACE EXTRACTION

After importing the geometry, I will extract Mid-Surface for each component and check the symmetry using the symmetry option. So this model due to symmetric I will mesh the model only half and reflect the other side. So my Meshing time can be required for lesser. So, Following Panel is used to extract the mid-surface

PREPARATION FOR MESHING

After mid generation it is required to remove the unwanted cuts, fillets ,pin holes so that we can achieve good mesh flow and avoid mesh failure

MESHING OF THE COMPONENT

before start meshing first load quality criteria and mesh parameter

after meshing it is required to check free edges duplicate and normal in the meshing

• Check for Normals -

Go to ---> Tool ---> Penetration

• Check for penetration & Intersection -

This check will be done for whole assemblies.

Go to ---> Tool ---> Penetration.

• Check for duplicates.

RESULT:

Hence we created a mesh for the given component as per the given quality criteria using HYPER MESH.

CONCLUSION :

Hence, the geometrical errors and mesh, with the given element Quality criteria has been performed successfuly. Also after meshing the component the thickness has to be assigned for the given component. As per methodology, From import cad, geometry clean up to mesh improvement phases have been performed successfuly. The Applying load & Boundry condition phases will be performed on upcoming challenges.