Challenge

Week 6

AIM: To establish the connection wherever is required in given component

PROCEDURE:

Step 1:-

The given is containing only FE model, so need of performing TOPO and geometry checks
Firstly started the connection from the door's supporting to the B pillar portion
Create points by On COG method from TOPO deck > Points > On COG

Step 2:-

In the above image you can see the body option is enabled, this will result in representing the bolt's body

Yellow line in the above image represents the Bolt body
If the body option is disabled then connection representation will be as shown in below image, it will form a cluster connection

Step 3:-

Other way of creating the connection is by using RBE2 by many node option from nastran deck
This method can be used where you can see only few portion of the connection
Steps followed in building RBE2 connections are
Select the slave nodes , master nodes and Finish the coneection
Slave nodes are the nodes which depends on the behaviour of Master nodes

Step 4:-

There are many types of selecting the nodes for creating Rigid body element
First one is by manually selecting all the nodes one by one , which is very time consuming
Next is using loop method , where just by selecting one element all the required nodes will be selected in one shot

In the above image using the loop method in single shot all the required 4 nodes are selected
In order to represent the washer connection too, it is always better to go with nodes mode, where you will be selecting respective entities instead of nodes as shown in below image

In the above image the perimeter of the hole nodes are selected which is the better way of representing the Bolt along with the washer

Step 5:-

When creating the hinge portion, use RBE2 by two node method
Just connect the two node of the rigind body element in the support
Now go to INFO option and relese one Degree of freedom, with respect to which the door has to rotate
In this case the door should rotate in Z direction(by refering vehicle co-ordinate system)
go to INFO click on the hinge connection and change CM(DOF) from 123456 to 12345
Because 6 is the Rotational degree of freedom with respect to Z direction

Step 6:-

On the handle's master node assign the mass by CONMi>CONM2> Nodes
Here the default mass representation unit will be in TONNES, keep that in mind and assign your mass

Step 7:-

Define the point by using connection manager
Select the respective parts P1 and P2, create PSOLID ID for the spot weld
Important is to keep FE Element type as RBE3-HEXA-RBE3 for this kind of weld
In this type the corner nodes will act as master node and middle one will be the slave node
Carry the same procedure for the places where spot weld representation has to be done

Step 8:-

After finishing all the Bolt and spot weld connection next is to represent the damping(weather strtip) for the glass
Use feat2curve option and extract the curve

Convert the curve into Spot line instead of Adhesive line, because adhesive line's motion will be restricted in all the direction

The bottom part of the glass will have weather strip in both sides in order to represent the same, the bottom curve will be transformed in respective direction with some distance

Define the curve in connections manager by keeping the FE emelent type as RBE3-CBUSH-RBE3
Select the respective parts P1 and P2 and give the needed spacing
Define the CBUSH ID(SHIFT+?) also for future reference

Step 9:-

Perform Step 8, arround the body because to represent the rubber strip running through out the body
The CBUSH representation will have local co-ordinate system, in order to change all the CBUSH element to vehicle co-ordinate system
As we defined the CBUSH ID previously, we will be using the same here and selecting all the elements right click and modify
change the orientation fro with Vector to With cord and chnge CID to 0(zero)

LEARNING OUTCOMES:

Learnt how to analyze diffrent connection
Understood Damping representation and alligning all the elements in same direction.

CONCLUSION

For the given model, the connections have been done.

Ship work like this
in your own course.