Meshing Hood using ANSA for Structural Analysis
Aim:
- Extract a mid plane and hem hood parts without any topological errors
- Generate a clean mash of hood within the specified parameters
Methodology:
- Topology clean up and midplane extraction
- Hemming of parts
- Assigning PID\'s and MIDs
- Meshing & Rectifying mesh errors
Geometry clean-up:
- Hood consists of outer panel and Inner Panel isolate each at a time and perform operations
- Clean the geometry using regural topo commands avoid cracks and triple cons.
- After geometry clean up extract mid plane using Mid surface or Offset.
- Extract mid planes of both inner and outer planes.
Hemming:
- Isolate only mid planes and perform hemming
- Hem is the overlapped area along edges of both planes
- project the overlapped edges onto both inner and outer planes
- Delete the hem up to fillet area and the inner plane which is under hem
- Then paste both planes results in a triple con which is acceptable in this case
Assigning PIDs and MIDs:
- Assign PIDs for individual planes and for hem region alone.
- Pl D\'s are assigned by set PIO command and selecting respective parts.below are the set of PID\'s s.
- MIDs are material IDs these are assigned while assigning PIDs by choosing MID in PID dialog box.
- Set thickness for planes as 0.75mm and hem region as 2.25mm while assigning PIDs.
Meshing & Rectifying mesh errors:
- Switch to Mesh mode -> set length-> select whole planes and hem -> give length as 5mm-> ok.
- Then set Quality Criteria-> shells->assign respective values specified for mesh-> apply-> ok.
- Then Mesh generation-> Best-> visible.
- There will be a lot of mesh errors so hit Reconstruct->select whole mesh->middle button-> edges>middle button.
- After Reconstruct there are again some errors there are rectified by walking over each and every error and rectifying it.
- some migth get fix by altering the geometries
Conclusion:
- Topo errors were taken care for the model.
- Took the mid surface for the inner & outer panel & thickness was assigned.
- Hemming process done for the hood.
- Meshed the model with 2D elements following the quality criteria.
- All the errors were eliminated.
Link: https://drive.google.com/open?id=1RlkMKzYTtP3-13wNFIOBGTLBRTO9jIxe