Challenge

Week 12:Project 2-Meshing of Rear Wheel Holder challenge

AIM: TO Extract the mid surface and mesh the given model according to the mentioned quality criteria

PROCEDURE:

Step 1:-

Import the cad model into the software
Look for the missing surfaces, Damaged surfaces and Free edges correct them
A missing surface is shown in below image
We can toggle the edges and correct the free edges
Damaged surface can be deleted and new surface can be created using filler surface or Ruled surface creation option

Step 2:-

After correcting the geometry errors we have to extract the mid surface for the model
Autocleanup the model by tools>autoclean up, using above quality criteria given
Extract the mid surface using 2d>automesh option
Extracted mid surface for the model is shown in below image

Step 3:-

Check the mid surface for damaged faces and free edges
Defeature few features which might fail for quality criteria
Before meshing the model , split the surfaces into small portions to control the mesh flow
To split the surface go Geom> quick edit> split surface using node to noide or node to line
Make sure the mesh flow should not be disturbed when the surfaces are splitted
So go to options(shortcut key O)>mesh> Keep mesh
Use "keep mesh" option when the surfaces should be split
Use "Advanced remesh" option when the surfaces are meshed

Step 4:-

Mesh the surfaces portion by portion , so that the quality errors can be be fixed simultaneously
Few feature are symmetric in the model, so instead of meshing the features again , we can mesh on one side and reflect the same to the other side
Symmetric features are shown in below image

Step 5:-

To peform reflect operation first we need to have a base point
inorder to create base point, go to distances and mesure the distance between two symmetric points and use create nodes between option
This will create point exactly between two points
Now go to Tools>reflect select the elements which has to be copied to the other side
Before reflecting the elements make sure duplicate of the elements have been created to the current component

Step 6:-

Correct all the mesh flow and failed quality criteria
The above image shows there are no quality erros in the model
Now we have to check for free edges or for equivalence
Inorder to check this go to Tools>Edges>select elements and finf the eqivalce and free edges like shown in below image
By this option we will have knowledge of gap in the model and connections of elements to one ohter
If you see any unwanted free edges that is apart from the boundary of the model, fix it using 2d>replace option
Below image shows theres no unwanted free edges

Step 7:-

Next to assign the thickness and material for the mid surface
Right click on the blank space under the model section, create property and material
Since there is no mentioning of which material should be used i will be using default Mat1 card, it is of steel properties
Next create Property for the mid surface as shown in below image
For property default Pshell property card will be used here
We should mention the thickness in property card so that the same wil be assigned to the component
On an average the measured thickness will be 0.78mm, so the same will be given in property card
Right click on the mid surface component and select assign
Final result is shown in below image

CONCLUSION:

Understood how to correct the damged faces
Understood how to stitch the elements together
Understood the concept of extracting mid surface
Understood how to controll the mesh flow
The given model mid surface is extracted and meshed according to the criteria given

Ship work like this
in your own course.