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OBJECTIVE: Import the given bottle cap 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…
Akash M
updated on 10 Oct 2021
OBJECTIVE:
Import the given bottle cap 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 bottle cap model. Go to File < Open.
The given geometry has different parts with different thicknesses.
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 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.
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. This geometry has different thicknesses, so we can’t use ‘midsurface’ option. So, the auto mid-surface extraction is impossible.
Manual mid-surface extraction:
It can be done using ‘offset’ tool in the same faces menu from the Topo module. Select the surface to offset and 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 and click offset. We can either retain the original geometry or can delete by clicking ‘yes’ or ‘no’.
The mid-surface of the ribs of the geometry are extracted by the middle option in the faces by selecting faces from both sides and then extend the ribs to the base surface. Extension can be done by using ‘extend’ option in faces menu in topo module.
Rotation of the mid-surface:
The geometry has twelve same kind of ribs on the top. We can take one mid-surface of the rib and rotate the same mid-surface for the other ribs. Go to utilities bar < Isolate < Transform < copy and then select the entities and rotate.
In order to use the rotate option for duplicating the mid-surface of a rib, axis of rotation is required. In order to create that, we should have at least center points. To create a point, ‘On COG’ option is used in ‘points’ in topo module. Select two circular lines one by one to create points one by one. In order to create axis of rotation, two COG points at the center with different height should be required. We would have taken one rib mid-surface. So, In steps we need to write 11 which will create 11 more mid-surface. Click on X box and select COG point 1. Similarly click on dx box and select COG point 2. By doing this axis of rotation will be created. Angle should be given. Angle = 360/no. of. ribs.
Same operation can be done for the tooths in the geometry.
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.
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.
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, assign different properties to the different parts. We can create new property on a property tool. Create properties with the measured thicknesses and apply that part to the created properties
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.
FINAL FE MODEL:
CONCLUSION:
The given bottle cap 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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