challenge1 Hypermesh crash worthiness analysis.

Challenge 1

Objective-

1. To study the flow of energy through the part by creating a 2D mesh of target element size of 5.
2. To correct the elements property to fulfill the quality criteria and to apply a generic property and material.
3. To do meshing on mid-surface and then project it on to the original geometry.

Case set up and Execution-

1. First of all checked for all errors in geometry and corrected it by using quick edit panel.
2. Deleted all unwanted lines & solids in geometry and then extracted mid-surface from it. Then provided washer surfaces for holes having dia more than 5mm and neglected holes having dia less than 5mm. Also corrected mid-surface geometry by replacing nodes etc.
3. Then started auto meshing, first did meshing of washer surfaces with even no. of nodes on inner and outer surfaces and then started meshing from center of geometry by taking element size of 5 units (used commands reflect, translate, offset etc.). Corrected the flow of mesh by re-meshing, smooth tool, replacement of nodes etc. Then aligned the mesh with geometry dimensions as much as possible.

4. Then checked for any connectivity issue and duplicates elements & nodes in meshing and corrected if any.

5. Set the quality criteria required like, min & max length, aspect ratio, warpage, Jacobin, skewness & included angles for tria and quad.

1. 6. Then tried to correct the failed elements in quality index as much as possible by using clean up tools.
2. 7. After getting acceptable results transferred the meshing of mid-surface onto original geometry.
3. 8. Then created a material for the component by using card image MAT1 & TRIPSTEEL & assigned property to the component by using card image PSHELL and thickness of 3mm to each component.

4. Result and Conclusion-

   1. Flow achieved is pretty good it means this component will transfer energy properly. As we can see that 20.8% elements are failed in min size criteria it is because at curved surfaces it is not possible to maintain minimum element size of 3.5mm, so we can accept these 79 elements. We should considered different elements size for small curved surfaces.
   2. Mesh flow achieved is pretty good it means this component will transfer energy properly through it.
   3. Mesh flow achieved is pretty good it means this component will transfer energy properly through it.