Week 3 - 2D meshing for sheet metal

Aim :

To improve the geometry clean up

A proper midsurface needs to be extracted

Meshing the geometry with proper flow

check for quality and improve the errors

Obtain the quality criteria with a proper mesh flow

Components:

Outer panel

inner panel

Two hinges

latches

Procedure :

step 1 :

A geometry check needs to be done

Clean the cons release and give topo

Use check geometry check for single cons and fix them

Give cross hatches and perimeter length and macros

Use the Midsurface skin to extract midsurface

lock it and use the pid region to use the skin work on it

step 2 :

In inner pannel the geometry is similar so half portion was taken for meshing the remaining half was transformed using copy option

Feature lines are necessary fo the best meshing

Toggle the unwanted lines and hot points

Create small sections using cut option and then start meshing

For meshing use the batch or best option select the area and give middle mouse click and mesh

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

Step 3:

once the meshing is done check for the quality parameters failing element

The failed elemnet can be improved using shell mesh improve option

Reconstruct option can also be used to select the Ent or Macro area depending on the regions

If the feature line is deleted it can be brought through Topo mode cons release and middle click and topo again

This will delete the mesh but bring back the feature line

Mesh it again check for quality parameteres off elements unmeshed area can be cheked through show only option available

This completes the geometry meshing as per required parameters

Step 4 :

If there is any unwanted or duplicate surface is there cleared

The opposite tria Elements are improved or reconstructed

The finished geometry needs to be saved using the save option

Example of finished geometry part and transform copy option used to mirror the part inthe panel

This gemotry are as per quality parameters

Learning outcomes :

Clean the geometry cad

Taking the midsurface skin

Meshing the parts separately

Quality pararmeters obtained with proper mesh flow

Conclusion :

The geometry clean up is done and Meshing as per required quality parameteres clearing the off elements and quality parameter failing elements for hood and the model for reference is attached