Week 3 - 2D meshing for Sheet metal

Aim: To perform preprocessing on the given front hood of a vehicle using ANSA

Procedure: 

• Open the provided iges hood file in ANSA.
• We can see the internal ridge structure of the hood of a vehicle.
• Every geometry consists of some imperfections which occur either by exporting the file or geometrical errors, In inorder to clean them firstly we need to locate and address these errors.
• To do that we need to perform Geometry check, go to the toolbar.
• While doing checks select the named criteria as per requried.

         Checks - Geometry Check - Select part -  Execute -Result 

• Now we can see multiples error naming single, double, triple cons, and unchecked areas. some of these can be auto-fixed, Fix those areas and the remaining areas should be done manually.
• If a triple con appears, apply topo from the tools menu and change into a double con.
• If a double con or single con appears fix it by deleting the hot point, releasing cons, and inserting new cons in the required areas. 
• If there are some irregular faces, delete those faces and create new ones by selecting the command new from the tools menu.
• Repeat this process until every error is removed.
• After removing errors perform a geometry check one more time to see if you missed anything, if we get 100% we can move to next step.

         

• Due to converting the part the software may not show the curves, so use  Auxiliarities - Fine to see the original part.
• Next for performing Mid-surface extraction we need to check the geometry's thickness at some random places.
•  After this we need to apply offset by selecting every face and extract mid surface.
•  Now perform the checks geometry again and clear the errors again.
• Again apply topo.
• For further steps apply mesh parameters as provided.
• apply average length of 5. 
• If the average lenght is not 5 at some areas adjust thoes areas by adding or subracting hot points.
• to apply mesh go to mesh section select classic mesh and further options are popped. 
• Then apply mesh as follows Mesh generation - Best - Select area.
• After mesh is completed clean the errors as shown in the quality criteria.
• To fix errors use the options from shell mesh - reconstruct - reshape - fix as follows.
• make sure to keep the tria percentage as low as possible.
• After fixing the mesh apply thickness to each part. 

Learning Outcomes : 

• In this challenge I learnt how to clean geometry.
• Learnt how to extract midsurface.
• Learnt how to apply mesh parameters.
• Learnt how to apply mesh and eliminate failure elements.

Result : 

• Midsurface is extracted from parent part.
• Geometry cleanup is done.
• Mesh parameters are applied.
• Mesh is applies and failing elements are eliminated.