Week 6

CONNECTION REPRESENTATION OF THE REAR DOOR USING ANSA:

Objective:

To create the necessary connections required for the rear door using different connection methods.

Methodology:

• Open the given FE model in ANSA19.0.1.
• Set separate PID'S for the rear door model.
• Make zone cuts in the bolt regions.
• To make a bolt connection use the auto method. First, create a cog point using the cog module option under points option in topo module. Then, convert that cog point to bolt. Then, using the connections manager select the bolt and select the p1 and p2 regions and change the FE rep type to bolt and enter the necessary value in the tab and select apply and then select realize option. Then, the bolt connection will be represented.
• To represent the mechanisms, select RBE2 module option and form a rigid surface around it.

For the Door hinge connection:

• Create RBE2 cluster elements. In order to make the movement of the rear door towards in z-direction delete the 6th degree of freedom by using the info tab in Nastran>Elements>info module option.

SPOTWELD CONNECTION:

• For spotweld connections, create cog point using cog option in the topo module. then convert cog point to spotweld point. Then using the connections manager select FE type as RBE3-HEXA-RBE3 and select the p1 and p2 areas and enter the search distance value in FE rep settings tab and select apply and select Realize option then spot weld will be generated.

For door handle:

• Initially use RBE2 many nodes elements to capture the areas and again using the same many node option . Select two centre nodes and form a connection between them.
• Then to assign the mass for the door handle use the CONMi>CONM2>NODES at COG.enter the mass value as 1e-4 (for 100grams). (the default value for mass will be tonnes in ANSA, so 100 grams is converted to tonnes).

For window regions:

• By using the feat2curve option curve is generated around the window area.
• Then, the curve is converted to spot lines.
• For the bottom area using the transform option, another spot line is generated because in the bottom area both sides have to select for the bush, while in the other three areas only outer surface was selected.
• Then, by using the connections manager select FE rep as RBE3-CBUSH-RBE3 and then select the p1 and p2 areas and enter the search distance value and then select apply and select realize option.
• Repeat the same process for another window area.
• The next step is to convert the C-bush to globally aligned value. To change that, select all C bush elements and then select the modify option and select orient and cid and enter the value as 0.Then all the C bush elements are assigned to global coordinates value.

BODY TO DOOR WEATHERSTRIP:

• By using the feat2curve option the perimeter edge of the door's inner panel is selected and then the curve will be generated.
• Then, the curve is converted to spot lines.
• Then, by using the connections manager select FE rep as RBE3-CBUSH-RBE3 and then select the p1 and p2 areas and enter the search distance value and then select apply and select realize option.
• The next step is to convert the C-bush to globally aligned value. To change that select all C bush elements and then select the modify option and select orient and cid and enter the value as 0.Then all the C bush elements are assigned to global coordinates value.

RESULT:

All the necessary connections are made in the given FE model of a rear door.

LEARNING OUTCOMES:

• All the different connections and where to deploy it are learned by working on this model.