FEA of Vehicle Front Stabilizer FEA of Vehicle Front Stabilizer Bar & Airfoil DesignBar & Airfoil Design

(Final Project)(Final Project)

Name: Antonio Sevilla & Sanh SiName: Antonio Sevilla & Sanh SiCourse: ME 272 FEACourse: ME 272 FEA

Professor: Jose GrandaProfessor: Jose GrandaDate: 12-20-06Date: 12-20-06

ObjectivesObjectives The objective was to simulate a crash test on a The objective was to simulate a crash test on a

vehicle colliding with a fixed wall at 50 mph and vehicle colliding with a fixed wall at 50 mph and analyze the stress distribution of the Front Right analyze the stress distribution of the Front Right Stabilizer Bar during the impact.Stabilizer Bar during the impact.

Additionally, we will also test an airfoil under Additionally, we will also test an airfoil under different loads to see how the stress distribution different loads to see how the stress distribution changes with respect to the forces that are being changes with respect to the forces that are being applied. We will apply forces to the leading edge applied. We will apply forces to the leading edge of the airfoil to simulate air resistance.of the airfoil to simulate air resistance.

ModelModel

Vehicle BodyVehicle Body The vehicle was created on Solidworks and The vehicle was created on Solidworks and

implemented into Nastran 4D. implemented into Nastran 4D. The material for the Vehicle Body is steel with an The material for the Vehicle Body is steel with an

ultimate strength of 6.5e4 psi.ultimate strength of 6.5e4 psi.

AirfoilAirfoil The airfoil was created using Solidworks and The airfoil was created using Solidworks and

implemented into Nastran 4D.implemented into Nastran 4D.

ModelModel

Suspension System Suspension System The suspension system was also created on The suspension system was also created on

Solidworks and implemented into Nastran 4D. Solidworks and implemented into Nastran 4D.

The system consists of Stabilizer Bars, Steering The system consists of Stabilizer Bars, Steering Knuckles, Strut Assemblies, Control Arms, and Knuckles, Strut Assemblies, Control Arms, and Tie Rods for each tire. Tie Rods for each tire.

The material for the suspension system like the The material for the suspension system like the vehicle, is also steel with an ultimate strength of vehicle, is also steel with an ultimate strength of 6.5e4 psi.6.5e4 psi.

Simulation: Stabilizer Simulation: Stabilizer BarBar

Views of the system before the simulation.Views of the system before the simulation.

Simulation: Stabilizer Simulation: Stabilizer BarBar

The impact created a maximum stress of 4.134e5 psi on the Front The impact created a maximum stress of 4.134e5 psi on the Front Right Stabilizer Bar, which is more than the ultimate strength Right Stabilizer Bar, which is more than the ultimate strength (6.5e4 psi) of the material. Therefore, the component will fail (6.5e4 psi) of the material. Therefore, the component will fail during the impact.during the impact.

Simulation: Stabilizer Simulation: Stabilizer BarBar

Views of the Stabilizer Bar during the impact with a maximum Views of the Stabilizer Bar during the impact with a maximum stress of 4.135e5 psi. stress of 4.135e5 psi.

Results: AirfoilResults: Airfoil Pressure distribution on airfoil at F=500 lbf (left).Pressure distribution on airfoil at F=500 lbf (left). Pressure distribution on airfoil at F=1000 lbf (right).Pressure distribution on airfoil at F=1000 lbf (right). As the force on the leading edge is increased, the As the force on the leading edge is increased, the

pressure distribution begins to shift from the pressure distribution begins to shift from the leading edge, to the trailing edge.leading edge, to the trailing edge.

Results: AirfoilResults: Airfoil

Pressure distribution on airfoil at F=1500 Pressure distribution on airfoil at F=1500 lbf (left).lbf (left).

Graph of force vs maximum Von Mises Graph of force vs maximum Von Mises Stress.Stress.

Force vs Stress (Front)

0.00E+00

2.00E+02

4.00E+02

6.00E+02

8.00E+02

1.00E+03

1.20E+03

1.40E+03

0 500 1000 1500 2000

Force (lbf)

Str

ess

(kP

a)

Front load

ConclusionsConclusions The objective was to simulate a vehicle colliding into The objective was to simulate a vehicle colliding into

a wall and analyze the stress distribution on the a wall and analyze the stress distribution on the Front Right Stabilizer Bar made of steel. The models Front Right Stabilizer Bar made of steel. The models were created in Solidworks. Then the system was were created in Solidworks. Then the system was simulated and analyzed on Nastran 4D. An FEA was simulated and analyzed on Nastran 4D. An FEA was performed and the data showed a maximum stress of performed and the data showed a maximum stress of 4.13X105 psi on the Stabilizer Bar during the impact 4.13X105 psi on the Stabilizer Bar during the impact and was enough for it fail.and was enough for it fail.

For the airfoil test the objective was to simulate air For the airfoil test the objective was to simulate air resistance to see how the stress distribution changes resistance to see how the stress distribution changes with respect to the force being applied. We found with respect to the force being applied. We found that as the force on the leading edge is increased, that as the force on the leading edge is increased, the pressure distribution begins to shift from the the pressure distribution begins to shift from the area of the leading edge closest to the base, to the area of the leading edge closest to the base, to the trailing edge. The maximum Von Mises Stress at trailing edge. The maximum Von Mises Stress at F=1500 lbf was found to be 1.16X10F=1500 lbf was found to be 1.16X1033 kPa kPa