Challenge

Week - 4 - 2D meshing for Plastic components

HHitesh Kumar25 Nov 2022

Solution

First open the file by going to File-Open

Now,After opening the file select the whole component and do Topo option (it connect the cons if they are not connected)

Now,check for any geometrical errors by going to Tools-checks-geometry Or search check on search box

select all the errors by Ctrl+A and then right click and fix the errors automatically

But,even after using automatic fix there remains one error and now i will fix it manually

Now,to solve this error first use release option in CONS

then you will see two different cons and then topo up them separately

error is now solved. so run the geometry check up again.

Geometry check up is done.

NOW, extract the Mid-surface

This is a plastic model with varying thickness and lots of features so we have to the extract the mid surface manually

there are different methods for extracting the mid-surface

I will show you the methods i have used

1.OFFSET

first,check the thickness by going to Utilities-measure-CONES

then click on FACES-OFFSET-select the surface-give the offset distance(half of the measured distance)

OFFSET is Done.

After offset is done, A new property will be generated and if you want all your mid surface capture in one property

then set property to use current (on right side bottom corner) .

2.CURVES-MIDDLE

To use this option click on middle on curves and select the first group of cons and then press middle mouse and then select second group.

after getting the curves , i have used fine option to make it look smooth

then i have project it on the surface and made the new surface.

another feature by curve-middle

3.FACES-MIDDLE

in this option all you have to do is select one side and then select other side and it will make mid- surface between them.

after accepting the surface,mid surface is generated

Done.

these are the options i have used for mid-surface extraction.

NOW, COG(ROTATE OPTION)

As you can see there are 26 features in a circular format and it will be very time consuming to make them separately

so,for this we use cog option by going to points-on cog

First, make the first extract the one feature and then make 2 COG for the Axis by selecting the small circle and one large circle or you can select by our choice.

Then,click on Transform-copy-select entities-then click on Rotate-click on cogs you have made and give angle and steps

Rotation is done.

Now,connect all the features to surface by project and using New surface option

and use Topo after doing the mid-surface

Mid-Surface is extracted.

Now,MESHING

before moving to meshing

delete the unneccessary hot points, use join option to toggle the cons which are less than element size.

step1.Give the Quality criteria

now,give the mesh parameters

Step2. Give Perimeter size for the component by selecting Length in perimeter and select the component and give perimeter 1(according to element size)