2D mesh using ANSA for Plastic components(Bottle Cap)

AIM :

To Check for the geometrical errors and mesh with the given element Quality Criteria for the given Component and to write a detailed report about the mid-surface and meshing Process.

PROCEDURE :

IMPORTING CAD MODEL AND GEOMETRY CLEANUP :

1. Import the given Hood Model in ANSA by using File-->Open

Fig: Bottle Cap Model

2. After Importing the CAD Model in ANSA, Go to Tool-->Checks-->Geometry for Geometry Clean up.

Fig: Checks Manager Window

3. In the above Checks Manager window click Execute to check any error occurred in Hood Model and fix the Error and Cleanup the Geometry.

Fig: Error in Bottle Cap Model

4. In The above window, an error has occurred in the given Geometry model. Check the error showing in the Model and fix the issue and clean up the Geometry.

5. While resolving the error, Right Click on the error which is going to resolve and click Show only option.

6.It will show only that Needle Face. Using Face-->Delete Option to delete the Unwanted Needle Face.

7. After deleting the Needle Face, that error has been resolved. Similarly, all errors have to be fixed, and again Click Execute in the Checks Manager, and 100% Geometry Cleanup is to be verified.

CREATING MID-SURFACE :

1. After geometry Cleanup and Mid-surface has to be created separately for Parent Top and Bottom Surface.

2. Before Creating a Mid-Surface, Go to Utilities-->Measure Option to Measure thickness of the Component for Creating Mid-Surface.

3. In the above window, Click two nodes to measure the thickness of the Component and Store the Measurement.

4. After Measuring the Thickness, Go to Faces-->Offset-->Faces Option.

5. Select the Face and enter the Offset Value to create a Mid-Surface for the Component.

6. After entering the Offset Value and click Ok and Mid-surface will be created.

7. After creating a Mid-Surface, Click Faces--> Set PID option and create New PID for Hinge Mid-surface in the properties.

8.Similarly Mid-surface has to be created for each surface based on thickness and Set PID for each part.

Fig: Extracted Mid-Surface

Fig: PID for above Mid-Surface Components

MESHING :

1. After Creating a Mid-Surface, set the given Quality Criteria for the Component.

2. Go Utilities-->Quality Criteria Option and assign the given Quality Criteria Values.

Fig: Quality Criteria

3. After assigning the Quality Criteria for the Component, Go to Utilities-->Mesh Parameters and assign the Average Value, Minimum and Maximum Value for Meshing.

Fig: Mesh Parameters

4. Go to Mesh-->Perimeters--> Length Option and Select the Component to Mesh and enter the Value of Perimeter Length and Macro Length for Meshing.

5. Go to Mesh-->Mesh Generation Option and Select the Mesh type to mesh the component.

Fig: Mesh Generation Types

6. Select the Mesh type in the Mesh generation and Select the Faces to mesh and Mesh will be generated.

7. Use Shell Mesh-->Reconstruct option to rearrange the Mesh and Use Shell Mesh-->Smooth Option to arrange Mesh lines equally within the Selected Surface and solving the Quality criteria issues.

8. Use Grids-->Paste or Elements-->Split / Swap / Joint Option to eliminate or reduce the trias and get better mesh flow.

9. Check if there are any off elements is present and reduce the off elements and some areas of off elements will be acceptable.

Fig: Mesh with Quality Criteria

10. Parent Surface thickness Value is to be Provide for the Mesh Component. Go to Lists-->Properties option and Assign the Thickness Value.

11. Go to Quality Parameter-->Presentation Parameters and select Draw shell as solid, click Apply and Ok.

RESULT :

In the given Bottle Cap model, extracted Mid-surface and then meshed. Parent body thickness is assigned to the meshed component by created Property and assigned to the separate component.

Fig: Bottle Cap Mesh with assigned thickness