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OBJECTIVE: Import the given car hood model into the ANSA software Check for geometrical errors and fix them to extract a proper mid surface. Mesh the given model with the given quality criteria Check and clear the failed elements (off elements)…
Akash M
updated on 04 Oct 2021
OBJECTIVE:
Import the given car hood model into the ANSA software
Check for geometrical errors and fix them to extract a proper mid surface.
Mesh the given model with the given quality criteria
Check and clear the failed elements (off elements) in the FE model.
To ensure the corresponding thickness of each surface is assigned to the FE model.
GIVEN QUALITY CRITERIA:
GIVEN COMPONENT:
PROCEDURE:
Open the given hood model. stp file. Go to File < Open.
The given component has four different parts with different thicknesses. They are Inner panel, outer panel, Hinge reinforcement (2) and latch reinforcement.
GEOMETRY CLEAN-UP:
After importing the geometry, there will be some topological error. In order to prevent this, we have to do a geometry clean-up which is in the too check’s manager << geometry.
The errors in the geometry can be fixed automatically using FIX option or if the errors are not fixed, we should clear them manually.
After all the errors are rectified, if you check the geometry the execution will be 100%.
MEASURE THICKNESS:
We have to measure the thickness throughout the part. If there is any change in thickness, then we have to keep them under separate property. Go to utilities tool bar and click the measure, now we can measure distance between nodes, edges, shells and other entities. We can store the measurement by clicking store in measure tool. It is observed that the Inner panel - 0.75mm, outer panel – 0.75mm, Hinge reinforcement (2) – 1.2mm and latch reinforcement – 1.2mm.
ORIENTATION:
We can see the faces in grey and yellow which represents the positive and negative side of the faces. The orientation is random. It has to be one side in grey and other side in yellow. Go to Topo < Faces < Orient < Visible.
MID SURFACE:
Now, we shall generate the mid-surface of each surface. This can be done using two different methods. It can be done using ‘midsurface’ tool in the faces menu or using ‘offset’ tool in the same faces menu from the Topo module.
1)Auto mid-surface exraction:
It can be done using ‘midsurface’ tool in the faces menu menu from the Topo module. The midsurface tool can be used for the component which is having uniform thickness. If the geometry is a closed one, we can use this option. But it will delete the parent geometry after mid surface generation. In order to prevent this, go to option list in the bottom and change the delete original faces tick into wrong mark. This option list is available in the bottom of the all the menu for each tool. To generate mid surface, we have to select the whole geometry and confirm the mid surface.
2) Manual mid-surface extraction:
It can be done using ‘offset’ tool in the same faces menu from the Topo module. Using this method, we can either create mid surface individually for each part or we can select the whole geometry using ‘Feature selection’. Then give half thickness i.e., -0.75/2 or -0.375. Give the positive and negative sign according to the direction of the arrow.
Use length option which can be accessed through the 'parameter' menu in mesh module mesh module. This tool works in creating a finer representation of the model.
MESHING:
Before starting mesh, the quality criteria should be assigned. Go to Quality criteria in utilities bar or use F11 key. Now check the parameters which are required, give the values and then click apply.
Also go to mesh parameters in utilities bar and give target length, minimum and maximum target length, element type and element order as per given details.
Before we do the mesh, we can observe that each of these components can be separated into symmetric halves. To save on time, its good practice to mesh onside of the component and reflect the mesh to generate on the other side. So, we can delete the one side of the inner and outer panel. Whereas for the hinge reinforcement, we can delete one of these two since they are mirror images of each other. The delete tool can be accessed from the top tollbar selection.
Cuts can be made using the ‘Cut’ tool from the meh module which is available in Macros menu. Now, we can split up the surfaces to rectangle regions to ensure the least number of trias. Existing feature lines can also be suppressed. This is done by right clicking the lines using the same ‘Cut’ tool.
In some cases, this needs to be carried out to prevent minimum length failure. In this hood component, the feature lines on either side of the peak in outer panel need to be suppresses to prevent element failure.
Now, we can mesh the component. We need to use ‘Best’ mesh option, which can be accessed from the ‘Mesh Generation’ menu in mesh panel. After meshing a region, use ‘Reconstruct’ tool from the shell mesh menu in the mesh module to reconstruct the mesh. It basically remeshes the selected mesh keeping the quality criteria and tends to produce a better mesh. This process is repeated until we mesh the entire component.
After reconstruction:
Mesh quality can be checked by switching to hidden mode. The is available in bottom of the tool bar. The failing elements will be highlighted in the colours as per the legend colours on the side of the screen.
The certain trias need to be avoided. Back to back trias, opposite trias, trias on the free edges, trias on the fillets, trias on the featured lines. In order to rid of this, use split, join and swap option in the ‘Elements’ menu in mesh panel. The opposite trias can be removed by splitting the quads between them using split tool, then joining the two adjoining trias formed using the join tool. After doing this, we have to smoothen the elements. Go to ‘Shell Mesh’ menu in mesh panel and click ‘smooth’ tool and select elements and click middle mouse button.
After meshing all the region, we have to reflect the component to produce the symmetrical region to complete the mesh for the entire component. This can be done using the ‘Transform’ tool in utilities bar. Now, we can select the entities that need to be reflected. After that go to the symmetry tab and proceed without changing any of the options.
After reflecting, draw shell as solid needs to be activated. For that go to Quality criteria and go to presentation parameters tab and check the ‘Draw shell solid’ and click apply and ok.
MESHED COMPONENTS:
INNER EXTRACT PANEL:
OUTER EXTRACT PANEL:
HINGE REINFORCEMENT:
LATCH REINFORCEMENT:
LEARNING OUTCOMES:
Learned to do topological clean-up
Learned to generate mid surface for complex geometry
Aware of all the quality criteria’s and quality parameters
Understood about mesh generation and generated mesh for complex geometry.
Learned to improve mesh flow and remove trias to achieve better mesh flow.
CONCLUSION:
The given car hood component was meshed as per required quality criteria, after carried out topology clean-up and generated mid-surfaces for each of its components and assigned thickness to each of them.
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