Week 3 - 2D meshing for sheet metal

Aim- For the given Hood Model. Taken the mid surface for all the components after checking the geometrical errors and mesh the mid surface with the given element quality criteria.

Quality Criteria-

S. No.	Quality Criteria	Value
1	Target/ Average Length	5
2	Minimum Length	2
3	Maximum Length	7
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

Procedures-

• At first we will import the model in ansa, the given hood model is having 4 components:- Inner, Outer, Hinge & Latch.

• Then After Importing we will check for topological Clean up, for checking we will first go to checks then geometry then selecting clean up errors using auto fix and use topo tool like new face, delete and topo etc. to achieve 100% error free model.

Mid-Surface Extraction-

• Manual mid surface are extracted by selecting  the faces of each component by mid surface then skin and selecting the faces then clicking on middle mouse button and giving suitable distance.
• Mid surface geometry is again checked for errors.

Outer Extract:-

Inner Extract:-

Latch Extract:-

Hinge Extract:-

Assigning Property and Thickness-

•  The mid surface of the components of hood are assigned with new PID and their thickness.

Meshing-

• The Mesh parameters and quality criterial as per the given are assigned.

• Cons and Hot points are altered as per the given criteria.
• Perimeter and macros are set for 5mm.
• For each surface are meshed by using best command in mesh generation panel.
• To get the good mesh flow we will reconstrtuct the existing mesh.
• Further failed elements and trias are removed using split, swap, join & smooth commands.
• The symmetric surfaces are reflected using transform then copy option.

 

Conclusion-

• Basic of ANSA GUI and its various tools.
• To clean up geometry of simple components.
• To extract mid surface and assigning the thickness & properties.
• To mesh the component as per given criteria with good mesh flow and less concentration of tria.