Week 9 - Creating connection for Rear door

                                                           CHALLENGE 13: CREATING CONNECTION FOR REAR DOOR

OBJECTIVE:

To deploy different 1D element connections required for the given rear door FE model.

FE MODEL:

                                           Different views of the Rear Door

PROCEDURE:

1. Assigning PID:

• The give FE model consist only single PID for the whole set. Therefore, we will be assigning diffferent PIDs to each section in order to proceed with connections.

         

                 

• Open NASTRAN module.

2. Hinge Connection:

• The hinge is joined by Bolt type connection that can be done using RBE2(Many nodes) option from NASTRAN module.
• Initially form cluster connection on the aligning holes. 

         

• Join the above RBE2 connections using RBE2(Two nodes) option.

         

         

• The formed two nodes RBE2 has to be constrained to all six degrees of freedom.

         

• Use the same method for other hinge as well.

3. PBUSH Connections for Glass:

• Separate out the glass PID from the model.

         

• Create an outline of the glass using Curves(Feat2Curve) option.

         

• Offset a copy of the bottom curve in between the glass and door frame.

                 

         

• Convert the curves into Spot-line.

          

          

           

• Select the Spot-lines one by one using Connection option.

          

• In Connection Manager, input the PID and connection details as shown below.

         

• PBUSH property card has to be filled in for the stiffness values.

         

• Separate PID has to be created for the PBUSH connection.

         

         

• Similar connection has to be done for all Spot-line around the glass.

         

• Then proceed to the next glass in the model.

        

• Create the spot-lines using curves.

        

• Repeat the steps for the former glass connections.

        

4. Connection by Spot-weld:

• Create a 3D point and Convert it to Spotweld point.

         

• Select the Spotweld point and input the required data into the Connection Manager.

         

         

• Assigning PID and Realise the connection.

         

5. Concentrated Mass for Door Handle:

• Create RBE2(Many nodes) connection and join them together as shown below.

         

• Select the COG point and assign mass concentration using CONMi option.

        

• Input the mass value(M) in Tonnes.

        

• Similar RBE2 connections are formed for Rigid attachments.

        

        

6. Final Model:

    

    

RESULTS:

The given Rear-door model has been completely connected with possible 1D elements in NASTRAN module.