Project 1

Aim: For the given plastic component (dash board) check the geometrical errors and draw the midsurface and proper meshing with the target length of 4mm. And satisfy the quality criteria


Quality Criteria:

S.NO	Quality Criteria	Value
1.	Target Length	4
2.	Minimum Length	2
3.	Maximum Length	6
4.	Aspect Ratio(AR)	3
5.	Warpage	15
6.	Skewness	45
7.	Jacobian	0.7
8.	Min Quad Angle	45
9.	Max Quad Angle	135
10.	Min Triangle	30
11.	Max Triangle	120
12.	Tria Percentage	15

Fig: Car Dashboard Model


Theory:
In this challenge the given model is plastic component and having of different thickness .while drawing we need to follow different approach like offset,Middle(under the curve) . The model having to many intricate surface auto mid surface is not possible. So i have used manual method which is offset.

And also model has 3D cad as well where is has no thickness and need to assume the offset value which is 0.5.


Steps to Follow:

1.Import the CAD model
2.Check the Geometrical Errors
3.Draw the Mid Surface and Extend to the face where ever is required
4.Enter the Quality Criteria
5.change the mesh length is 4mm
6.Mesh The model and Improve the Mesh.
7.Set Pid

1.Import the CAD model:

Import the the model by going File >open, once the model is imported goto>mesh>perimeters>length, select the entire model and give length is 1mm this is to get fine mesh entire the model .Image as shown below.







Fig:Topo Model





2.check the geometrical Errors:

After the perimeter and macros length changed to 1mm we need to check the geometrical errors Goto >Tools >checks >Geometry and we need to marks the what are the checks that model need to pass like triple cons,cracks,needle faces and execute it shows somes errors some of the errors goes out by using Auto fix option the advantage of the auto fix option it can fix errors possible by ANSA and some of the errors cracks,needle faces need to clear from our side. Make sure clear the all the errors and geometry status is green.



Fig:Geometry issue



Fig:Geometry check status


3.Draw the mid surface and Extend till face where ever is Required:

Here the component having different thickness measure the thickness at the random places and proceed for the offset faces.once the rib surface is extended to the face triple con is coming into picture as shown below.



Fig: Extended Rib Face


4.Quality Criteria:

in Presentation parameters and mark the elemet percentage and domain effect bring to zero.




and the apply and ok.Once the quality criteria entered and in utilities mesh parameters enter the target length and min and max target length as shown below.




Fig: Mesh Parameters


5.change the mesh length:
From the question the target length is 4mm mesh>perimeter>length>select the entire model and enter the length as 4mm.

6.Mesh the model and improve the mesh:

Here i have followed some Techniques to avoid tria concentration and off elements .i removed the unwanted hot points and cons which is below the 2mm which gives the element failure and where ever the the tria concentration is i have used the faces>cut option to avoid rotating quads and trias and near the curved regions tria concentration is not avoided and i have used manual mesh by applying area by area so that eliminate the trias and failure elements at the same time only.
Options that i have used is
Spot mesh,batch mesh,smooth and reconstruction,cut,join,mv free,split,paste,orign,remesh.


Fig:Mesh Flow

The mesh flow should be parallel and perpendicular.

Fig:final meshed geometry Result



7.Set Pid:

Here we need to create the property id of the MID and ribs shown below.



Fig:Pid of the midsurface


Learning Outcomes:
1.i have learnt the modelling
2.EXtraction of the Mid surface from the Parent geometry.
3.Mesh pattern and working on mesh flow.
4.And meshing Techniques.
5.Approaching the Mid surface generation when different thickness exist and assumptions


Result: For the given Dashboard component geometry checks ,mid surfacing,meshing hasbeen done.


Quad Elements : 95.07%
Trias : 4.93%
Off Elements : 1.73%


Here below i have attached model link

https://drive.google.com/file/d/1Mw448hkwYNimtEvbF5u8_J4-fgWm47WA/view?usp=sharing