Challenge

Week 4-1D Element Creation Challenge

SSyed Subhani Basha29 Apr 2022

OBJECTIVE
To mesh the given component with the size of 5 Units, creating 1D elements on given component with given cross-section and DOF.

CAD MODEL IMAGE

PROCEDURE

Starting with selecting OptiStruct as default in user profiles
Import the component using import geomentry in tool bar and file type as IGS
First we convert the CAD Model to Surface
Open midsurface in Geom, change extraction options to skin offset and extract the top geomectric surfaces and rename it as Bracket_1
Create a new component as Bracket_2 and do the above step for bottom geomectric surface.
Change the color of Bracket_1 and Bracket_2 as blue and green respectively
Delete the diplayed surface using delete in tool bar and delete the components above Bracket_1 in tab area
After deleting open organize in tool at main menu bar, select bottom surface and move them (check whether model is in Bracket_2)
Now delete the mid surface in components in tool area
Thus CAD Model is converted into Surface
Secondly, we mesh the given component
Give washer split of offset value 8 at holes to surface component from quick edit in Geom
Open automesh from 2D, by keeping element size to 5 with mesh type as mixed.
Now adujust the nodes near holes for good and quality mesh, mainly near fillets.
Now Meshing of the component is compleated
Thirdly, we will give RBE2, RBE3 at the holes and creating give cross-section
a) Now open rigid in 1D, choose calculate nodes and multiple nodes and tick DOF1, DOF2, DOF3 only to constrain translation rotation.
Place the nodes at 'a' hole and it's washer offset by changing to by path at blue surface.
Do the same step as above for green surface.
b) Open RBE3 in 1D, choose calculate nodes and tick all DOF's for constraining.
Place the nodes at 'b' hole and it's washer offset by changing to by path at blue surface
Do the same step as above for green surface.
c) Open RBE3 in 1D, choose calculate nodes and tick DOF1, DOF2, DOF4, DOF5 for X and Y constraining.
Place the nodes at 'c' hole and it's washer offset by changing to by path at blue surface
Do the same step as above for green surface.
Now for creating cross-sections, open HyperBeam, choose standard section
click thinwalled box > create and rename as Rod for box cross-section
click standard I section > create and rename as Beam for I cross-section
click standard X section > create and rename as Bar for X cross-section
Thus RBE2, RBE3 and cross-sections are created as required
Finally, we'll create rod, beam, bar and assign them cross-sections at 'a,b,c' and mass at 'd,e' and spring elements at 'f'
To create a rod, click rod in 1D and select top and bottom nodes of RBE2 and change elem type to CROD
To create a beam, click bars in 1D and select top and bottom nodes of RBE3 and change elem type to CBEAM
To create a bar, click bars in 1D and select top and bottom nodes of RBE3 and change elem type to CBAR
Now for assigning cross-sections, first create properties as rod, beam, bar
Then choose PROD as Card Image and Rod as beam section for Rod
And then choose PBEAM and PBAR as Card Image and Beam and Bar as beam section for Beam and Rod
Now to update these properties to model open Rod and update property as Rod and update it
Then do the same for upadeting Beam and Bar but open bars instead of rod
Now change to 1D Detailed Element Representation
For Creating mass create RBE2 using rigid in 1D at 'd,e'
Open masses in 1D, create masses with magnitute 10 and by change elem types to CMASS1
For creating Spring element, open connectors > spot, change type to spring and select nodes at 'f' and two components by change tolerance to 15 and click create.
Thus rod, beam, bar are created and assigned them cross-sections at 'a,b,c' and mass at 'd,e' and spring elements at 'f'