2D Meshing of the Bottle cap using ANSA Workbench

Aim:

To check the geometrical error of the component and to do the 2D meshing for the component /considering given quality criteria.

Procedure Followed:

1)Import BottleCap.IGS file into the ANSA

2)Geometry Cleanup of the Component

3)Mid Surface Creation and Extraction

4)Thickness Assignment

5)Defeaturing

6)Meshing

Given Quality Criteria:

Sl No	Quality Criteria	Value
1	Target/Average length	1
2	Minimum Length	0.5
3	Maximum Length	3
4	Aspect	3
5	Warpage	15
6	Skewness	45
7	Jacobian	0.7
8	Minimum Quad Angle	45
9	Maximum Quad Angle	135
10	Minimum Tria Angle	30
11	Maximum Tria Angle	120
12	Tria Percentage	15

1)Geometry Cleanup:

Import the Bottle Cap.IGS into the ANSA and Set the proper orientation and change the perimeter length to 1(MESH>PERINETER>LENGTH).

2)Geometry Cleanup of the Component

• Check all the geometry errors in the checks manager(Checks>Geometry>Execute) as shown in Fig 2.1

Fig 2.1 Geometrical Errors

• Eliminate All the Triple Cons and Cracks between 2 Surafces by releasing thr triple cons and applying topo as shown in Fig 2.2

Fig 2.2.Geometry Cleaned up

3)Mid Surface Creation and Extraction

Mid surface has taken manually as the component has varying thickness which is too less which causes quality criteria failure in the auto mid.

Manual mid surface is taken by using 2 commands

a)Offset Command (Topo Mode>Faces>Offset) in which we have to select the faces for which we need the mid surface and later we need to input the offset value(Half the thickness).

Negetive and positive signs indiactes the direction in which the value need to offset

b)Middle Command (Topo Mode>Faces>Middle) in which we need to selct the 2 faces for wich we need mid surface and on confirmation it will automatically generate the mid surface.Here no need of any offset value as shown in Fig 3.2

Fig 3.2 Mid Surface by Middle

4)Setting New PID and Thickness Assignment

Once after the extraction of Mid surface,We need to assign the new property ID for the Component.

• To give new property ID go to SET PID Command(Topo Mode>Faces>Set PID)
• Select the portion for which you need to assign new PID.On Confirmation the property Tab will popup on the Screen.
• On Right Click,Go to New>PSHELL the new prperty Card will popup on the Screen.
• Enter the Required data and thickness and click OK.The new PID is created and thickness is assigned to the selected faces as in Fig 4.1

Fig 4.1 New Propery Card

5)Defeaturing

As we find there are so many cons in the component and the diostance between some of those cons are below the minimum length which cause the minimum lenghth error after Meshing.So we need to eliminate all those unwanted cons,Edges and fillets using Cut Command (Topo Mode>Faces>Cut) as in Fig 5.1

Fig 5.1 Defeaturing

6)Meshing

• Switch from Topo Mode to Mesh Mode
• Enter the Mesh Parameters (Utilities>Mesh Parameters) and Quality Crieteria (Utilities>Quality Criteria F11) as shown in Fig 6.1

Fig 6.1 Quality Criteria and MEsh Parameters

• Now Mesh the Component.(Mesh Generation>Best>Select)
• If need any modification in meshing Use Reconstruct Command (Mesh Mode>Sell Mesh>Reconstruct)
• If need any Smoothness in meshing Use Smooth Command (Mesh Mode>Shell Mesh>Smooth)
• To move the Trias to upward direction use Split command (Mesh Mode>Elements>Split) and to move trias to right or left use Swap Command(Mesh Mode>Elements>Split).
• To move the trias to downward direction use Paste Command(Mesh Mode>Grids>Paste).
• Avoid Rotating Quads by splitting teh rotating quads in to two trias.
• While meshing all the given quality criteria must be satisfied.

Fig 6.2 Meshing of the Component

Now the Mid surface is Visualize in th solid shell by Enabling Draw as Solid Command(Utilities>Quality Parameters>Presentation Parameters>Draw shell as Solid) as shown in Fig 6.3

Fig 6.3 Meshing as Solid Shell

Thus the Meshing is done for the Given Component.

Learning Oucomes:

1. Able to fix Hepmetrical Errors and Geometric Cleanup of the Component.
2. Able to Creating and extracting of Mid Surface from the Parent Geomtery of the plastic Component.
3. Defeatiring of the Component
4. Meshing of the Component considering al given quality Criteria.
5. Removing Trias and Rotating Quads.

Conclusion:

In the above challenge we can conclude that the Meshing process is very similar to the any complex geometry and it is observd that Before meshing we need to tp observe and study the model carefully as it has varyig thickness and need to assign new property to each of them with respect to their thickness.Now the Mesh is generated for the bottlecap and all the Elements meets the given quality criteria .Thus the Model can be given for next Solver Process.

Google drive sharable Link of the model:

https://drive.google.com/file/d/1W6O6qiNAM2myNAzOYkTSPv1YI_iv8_hD/view?usp=sharing