Week- 8 - Solid meshing

AIM :

To mesh the given rear view mirror assembly using 3d tetra mesh by given quality criteria and fix all the errors while meshing.

Quality criteria:

shell elements:

S.No	Quality Criteria	Value
1	Target/Average length	1
2	Minimum Length	0.5
3	Maximum Length	2

Solid Elements:

S.No	Quality Criteria	Value
1	Tet collapse	0.2

PROCEDURE :

• First import the cad model in ANSA software

• Now use the topo tool in topo-faces-topo for connect all single cons into double cons.

• After correct orientaion in single grey colour for all component

• Intially check the geometry for errors or sharp edges or single cons or crack faces using checks-geometry. select all the errors and auto fix some errors are fixed in manually

• Now change the tpo module to classic mesh and assign the length of 1mm for perimeters and macros for finer resolution using tool mesh-perimeters-length and it will be used for achieve the target length while meshing

• now set the mesh parameter and quality parameter.
• this model is solid meshing, so i can switch on shell and solid in quality criteria

• If any fail for minimum while meshing we have to suppress construction lines.

• Solid meshing is two different types of creating the element in ANSA, one trias and another one is ortho tria
• ortho tria is use for curved surfaces, and trias are used for surfaces
• first i will seperate and work on the each PID region

• first i will create element in the curve region in using the ortho tria
• Change the mixed to otho tria in mesh parameter and click the spot mesh and mesh the curve region, if he elements are not proper, then do the reconstruction

• after complete the curved region, now change the ortho tria to trias in mesh parameter.

• Now start the flat region using spot mesh

• after complete the mesh, now convert the 2d to 3d
• change the claasic mesh to volume mesh, and define the volume in visible

• this model is 4 volumes and 4 undefined and unmeshed volumes

• now we mesh for undefined volumes in tetra rapid
• after mesh 4 undefined volume, now its created the 3d mesh

Learning outcomes:

• Properly learnt how to mesh the component for solid meshing, how to mesh the component with a lot of features using trias & ortho trias, how to change the 2D shell elements into 3D elements, how to clear the failing 3D elements for tet collapse.

Conclusion:

• The given rearview mirror assembly are meshed for the given quality criteria and assigned volumes for the 2D shell elements.