MESH CLEAN UP ON 2D SHELL ELEMENTS
PERFORMING MESH CLEAN UP ON 2D SHELL ELEMENTS
Objective:
To be able to create the 2D Mesh with target length of 5mm (Min 3.5mm to max 7.0mm) on given three components followed by
- Cleaning the geometry,
- Extract the mid surface,
- Clean the mid surface,
- Ignore holes less then 5mm,
- Create mesh with given specification &
- Assign proper thickness, by creating generic property.
Case set up and Execution with images:
1.Cleaning the geometry
Geometry Editing is followed by removing the unwanted lines on the surface, free edges on the components, extra surfaces, find and replacing the lines on the edges, trim the unwanted surface of the components, removing the unwanted points on the surfaces and toggle the edges or surface corners where necessary with appropriate tolerance and offset values.
These geometry editing is followed by
- Geometry import: File>Import>Geometry from drop down menu
- Geometry Edit is mostly through Quick Edit, Edge Edit and Point Edit
Quick Edit (Geo>Quick Edit)
Edge Edit (Geo>Edge Edit)
Point Edit (Geo>Point Edit)
Components before cleaning the geometry
By changing the auto to mixed and shaded to wire frame in the visualization tool bar we find the errors (in red color) on the geometry.
Components after cleaning the geometry
2.Extract the mid surface of given three components
Extraction of mid surface is followed by clicking the geometry on the menu pages and selecting the mid surface on the panel area.
Geo>Midsurface>Surf (Select the component)>Extract
Components after extraction of mid surface
3.Clean the mid surface
Clean the mid surface by checking the surface corner lines on the midsurface and join them by replacing points option on the quick edit panel in the geo menu page. And also remove the excess points on the surface, holes and in fillet areas.
Finding the free points before cleaning
After cleaning the mid surface
Before removing the excess points on the circles
After removing the excess points on the circles
By this way we are going to clean the midsurface to create mesh on the components.
4.Ignore holes less then 5mm
Based on the crash analysis of the component we have ignore or remove the holes less then 5mm.By using filler surf option on the quick edit panel in the geo menu page or press F4 in the functional keys with tolerance 0.01mm and toggle them in the same panel.
Checking the hole diameter: Geo>Distance>Two points or Two nodes (To check distance)
After checking the all holes in the surface we ignore all the holes in that surface.
After ignoring the 5mm holes surface shown in the below pictures
5.Create 2D Mesh with target length of 5mm (min 3.5mm to max 7mm)
Mesh-Meshing is a Process of subdividing the structure to Finite Elements.
Mesh creation is followed by changing the geo to 2D in menu page and selecting the automesh option in the panel area or Press F12 in the functional keys.
Mesh:
2D>Automesh>select the surface>Give 5mm element size & Mesh type Mixed>Mesh
Components before meshing After ignoring the holes less then 5mm
Create the meshing on the all surfaces of the components and change the mesh style which it will be appropriate to quad element. Reduce the triangle elements in the surfaces. And also recreate the elements shapes through automesh in which the size and shape of the components less then 5mm.
On creating the mesh through first go to mesh them and align the sizes through mesh style by clicking set all in the elem type, changing the autodecide to map as rectangle and clicking the set all in the mesh method follow through align, smoothing and mesh them.
Components after meshing
Checking the elements size
Checking the elements size through changing the option Tools in the menu page followed by selecting the check elements, give the specification attached below and check.
Tools>Check Elements
Example:
6.Assign proper thickness, by creating generic property
Before assigning the thickness we have to organise the elements to original surface through Tools > Organise(Shift+F11) > Change the dest component to original > select all elements > Move.
Creating the generic property through selecting the property id in element editors and select which element.
Assign thickness by editing the property id in the same entities editor and give 2mm thickness and changing the 2D detained element representation in visualization tool bar.
Assigning thick ness to the component
Changing to 2d element representation
Components after assigning the thick ness and changing into 2d representation
Result:
2d mesh is created on the given three components (Practice, Clip& Mounting Bracket) with element target length of 5mm of minimum 3.5mm to maximum 7mm is successfully by following the procedure i.e., Cleaning the geometry, Extract mid surface, Clean the mid surface, Ignore holes less then 5mm, Create 2d mesh with given specifications and Assign proper thickness by creating a generic property.
Conclusion:
By this assignment I am able to learn about how to create mesh the 2d components with given element length, how to import cad or cae files into the hyper works, how to utilize the Graphical user interface for creating the 2d meshing (i.e., Visualization tool bars, menu pages, panel bars, Required Functional keys) and also how to check the elements for Quality index.
Google drive link:
https://drive.google.com/open?id=15iLtPB_YRWqd1cuIbqay6QoqXFVxFnCd