Side crash analysis of neon BIW model

Objective: To perform the side cash analysis of Neon BIW model on rigid pole to analyze following.

a)Sectional force in the cross member.

b)Intrusion at B pillar,hinge pillar and fuel tank region.Provide recommendation on what can help to reduce Fuel tank intrusion.

c)Peak velocity of inner node of the door at node 337773.

The preprocessing is done by hypermesh and analysis is done by RADIOSS solver and postprocessing is done by hyperview and hypergraph.

Procedure:

• Check unit system and either follow [Mg mm s] or [Kg mm ms].

The current unit system for given model is [Kg mm ms]

• Import th model.
• Delete all the previously applied interfaces and add Type 7 interface to the model.Self contact is assigned to the model with the following details.

Inacti=6,Idel=2,Gapmin=1,Igap=2,Istf=4,Iform=2,Ifric=0.2.

• The intrusions and penetrations for the model are resolved.
• After comparing 300 k neon model the dia of rigid cylinder=254 mm.
• To create rigid cylinder go to hypercrash-create-rwall-cylinder-Dsearch=500-Type-sliding friction-enter friction value as 0.1 and enter the co-ordinates of head and tail components of cylinder.

• To adjust the location of CG to driver seat add 700 Kg of mass to the lower BIW pannel of body.

• Create initial velocity card of 15.56 m/s in Y direction.

• The time step of 0.0005 ms and time step of 80 ms is set.
• The cross section is created at lower cross sectional member.
• Create output blocks for sectional cross member,intrusion at B pillar,hinge pillar and fuel tank connector.

Output:

• Intrusion at pillar B

To measure intrusion go to hyperworks and measure the attached spring distance before impact and after impact.In this case the intrusion is 1303-706=597 mm.

• Intrusion at hinge pillar.

In this case intrusion is 1303-895=408 mm

• Intrusion at fuel tank.

In this case intrusion is 1303-706=597 mm.

• Sectional forces in cross member 1:

The max force is 0.12 kN at time 80 ms.

• Peak velocity at handle of the front door pannel.

The peak velocity at inner door pannel is found to be 16.8 m/s at 18 ms.

• Energy curves

The above curve shows the energy dissipition nature in the system.The max internal energy at 80 ms is around 11000 Joule and max kinetic energy is 21000 Joule and hourglass energy remains constant.

• Final Results:

a)Intrusion at pillar B=597 mm

b)Intrusion at hinge pillar=408 mm

c)Intrusion at fuel tank connector=597 mm

d)Resultant force at cross section member 1=0.12 kN

e)Peak velocity at inner node on front side door pannel=16.8 m/s

f)Maximum Internal energy=11050 J,Max kinetic energy=21000 J,Hourglass energy is zero.

Google Drive link:https://drive.google.com/open?id=13D6HujyyiIpoTEJfoteRSmgBWnR0fZRH