Week 6-Meshing of Hood Challenge
AIM:
To determine the given challenge.
OBJECTIVE:
To extract the mid surface for each component and mesh the given hood component with the given target element size of 5mm mentioned quality criteria.
THEORY:
TOPOLOGY:
It describes how elements are bounded and connected.
GEOMETRY:
It describes the shape of each element.
MESHING:
A mesh is a network that is informed of cells and points. It can have almost any shape in any size and is used to solve partial diffrential equations.
Each cell of the mesh represents an individual solution of the equation which combined for the whole network result in a solution for entire mesh.
FEM allowed for mixed types of mesh cells and unstructured meshes became feasible.
2D - Structural Mesh.
3D - Unstructured as well as structured mesh.
PROCEDURE:
1.To Import Up The Geometry:
Import the geometry by clicking on the import option and select import geometry.
Select the file type to STEP.
Browse and select the file that to be imported.
Click the import button.
The model is imported on the hypermesh and make it fit to the graphical area using F key.
As the model consists pf the various components we should extract the midsurface for the each components and do the topology cleanup.
Generally there are five components in the model. Namely
I.Inner_extract_body1
II.Outer_extract_body1
III.Hinge_reinforcement_extract_body1
IV.Hinge_reinforcement_extract_body2
V.Latch_reinforcement_extract_body1
2.Mid-Surface Extract:
For the above five model the midsurface to be extracted and arrange them.
The midsurface is extracted for the each component using the midsurface option form the geometry menu.
Now the midsurface has been extracted and renamed and given colour for each component are,
Inner_extract_body1:
Inner_extract_body1-midsurface:
Outer_extract_body1:
Outer_extract_body1-midsurface:
hinge_reinforcement_extract_body1:
hinge_reinforcement_extract_body1-midsurface:
hinge_reinforcement_extract_body2:
hinge_reinforcement_extract_body2-midsurface:
Latch_reinforcement_extract_body1:
Latch_reinforcement_extract_body1-midsurface:
3.Cleanup Component:
Now the cleanup has to performed in the midsurface of the each component.
Check for any defects in the mid surface by changing the geometry topology mode.
Remove the defects.
Now go to the auto clean up option in the geometry menu and select mid surface to be meshed.
Toogle the unneccessary lines by using toggle edge tool and create lines where is neccessary by using the split surf node and split surf line tool.
4.Meshing:
After the autocleanup go to 2D mesh menu and select automesh option, change the element size to 5, element type to mixed and select the mid surface and click mesh to generate the mesh.
Now the mesh has been generated for the components.
i.
ii.
iii.
After generating the mesh, check for the quality criteria to perform the quality criteria firstly edit criteria go to preferences option and edit the criteria as given in the table.
5.Qualtiy Check:
After meshing and quality check smooth the elements using the smooth option from 2D tool bar.
Performing the same procedure for all the components.
For the inner extract body mesh cannot be done for the whole component so first half of the geometry meshed because the nodes exceed the student version.
To mesh the other half go to the tools menu and select reflect and select the elements to reflect and duplicate the elements.
Change the vector selection to the required-axis as and select the centre node of the complete geometry and click reflect.
Same procedure for the outer extract body:
Quality has been done.
OBSERVATION:
Thus the given hood assembly is meshed sucessfully according to the mesh quality provided and quality is checked.
RESULT:
Thus the given challenge is determined sucessfully.