Week 3 - 2D meshing for sheet metal
Aim- To Mesh the sheet metal compoments such as inner compoment of the Hood,Outer compoment of the Hood,Latch and the Hinge Using Ansa.
Objective- Geometry clean up of the compoments,Extraction of the midsurafce and the mesghing compomeny,Assiginhg the thickness.
Procedure-
Geometry clean Up- After importing the geometry we will lock different compments in the different store so for easy valuation using thye inot option .we check for the single cons,cracks,tripple cons in the surafce if they are present they are fixed manully or automatically.
Fig1- Locking of the compoment
Fig2- checking for the geometrical issues
Extraction of the mid surface - After geometry clean up we extraxct the mid surafce mid surface is the respenttion of 3D geomtery in to 2D geometry. We exreact the mid surafce in oreder to reduce the time.The extractioon of mid surafce can be done by both manully and the automatic here i preferd by manully using the offset option. Faces>offset>select> Feature>cross hatches and giving the distance offst distance.After extraction one again we eill check the geometry for irreguties and we will topo the whole compoment. and for inner compment and outher compment we take symmentry as it will time saving meshing on one side and reflecting on another side.
Fig 3 Inner Hood Mid surface
fig 4- Outher Mid surafce
Fig-5 Latch Mid surface
Fig 6 Hinge mid Surafce
Meshing of the compoment- Before messhing we set the mesh parameters and the qyuality parametrs and we assign the perimeter of the average target length to the whole compoment, we defeature the areas where in the region is less than the minimum length using the option like cut and the join . To have proper mesh the following points are advised
1.There should not rotating quad ad it having more stifnrss and it interput the results
2.No oppiste trias should be there in near to each other.
3.No tria should touch the constrution line.
4.No tria transition should be there in the fillet in the region
5.Back to back tria are eleminated.
6. All circles are maintained with even number of edges.
The above certeris where followed to get the proper mesh flow
Fig 7 Inner mid surafce
Fig 8 Outher Meshing
Fig 9 Hinge Meshing
Fig 10 Meshinh of the LAtch
Qulity certeria-
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
10
Tria Percentage
15
Fig-9 Faliure elemnts
Concdlusion
we leant how to do geometric clean, extraction of mid surafce and meshing the compoments with proper mesh flow and quality certeria.