Assignment 1-2D Meshing Challenge

Objective :

For given models perform geometry clean up ,extract mid , clean midsurface geometry . mesh them and assign proper thickness

Given data :

1)quality criteria – target length 5 mm , min 3.5 mm , max 7 mm.(holes less than 5mm should be removed )

2)three different geometries

Procedure :

Import the model in hypermesh environment through (import solver deck available on upper tool bar > import model > and select .hm file which is required to be worked )

Figure 1 part 1

Figure 2 part 2

Figure 3 part 3

After importing the models and viewing them in 2D TOPO (geometry colour mode) .geometries have some free edges and overlapping surfaces as shown below

These free edges and overlapping surfaces has to be remove before extracting mid surfaces from these parts,this can be done with deleting over lapping surface and free edges can be corrected by toggle which is available in geometry panel > quick edit

Once geometry is been cleaned mid surfaces for these parts is extracted by using auto midsurface

After mid surface extraction from these parts some necessary changes has to be done in the mid surfaces so that element should not fail in quality criteria these changes might be removing fillets with narrow area , pinholes , and cones having small distance then minimum element length

Figure 4 removing pinholes

Figure 5 pinholes are removed here

Figure 6 removed fillets which are failing for minimum length

Figure 7 part 2 in here washer split is added

Figure 8 before removing pinholes in part

Figure 9 after deleting pin holes

After this mesh is to be generated with shell elements size of 5mm where ever washer split is present is meshed first then rest of geometry is meshed

The mesh element are refined to reduce the number of element failure and finally optimized

Figure 10 meshed part 1

Figure 11 meshed part 2

Figure 12 meshed part 3

Finally thickness has to assign to the mesh according to the thickness of parent geometry .

Conclusion :

The three geometries are cleaned ,midsurface are extracted and the mesh is optimized in order to meet element quality criteria .and the property of the geometry is also added according to the corresponding thickness