PresentationPresentation

Simon Tang & Brian HaganSimon Tang & Brian Hagan

GeometryGeometry

Zenetti Five Wheel 18 x 8

MaterialMaterialAluminum Silicon

Alloy

A356-T6

Si – Silicon7.0%

Cu – Copper0.2%

Mg – Magnesium.35%

Mn – Manganese.10%

Fe – Iron0.2%

Zn – Zinc0.1%

Sand CastDensity: ρ = 2.67 g/cc (0.0965 lb/in³)

Tensile Strength: σu = Ultimate 234 MPa (33900 psi)Tensile Strength: σy = Yield 165 MPa (23900 psi)Modulus of Elasticity: E = 72.4 GPa (10500 ksi)

Poisson's Ratio: ν = 0.33

Load IdentificationLoad Identification

2007 Nissan 350Z w/ Zenetti Five 18 x 8 Rims

Weight: 3339 lbs

Weight Distribution: 53/47 (Front/Rear)

3339 lbs x 53% = 1769.67 lbs / 2 = 884.835 lbs (Load On L/R Front Wheel)

3339 lbs x 47% = 1569.33 lbs / 2 = 784.665 lbs (Load On L/R Rear Wheel)

MethodMethod

Rotational ElementRotational Element

Rotational Velocity dependent on car speed and tire thicknessRotational Velocity dependent on car speed and tire thickness For experimental purposes, speed of car is estimated at 60mph For experimental purposes, speed of car is estimated at 60mph

with the tires adding 2 inches to diameterwith the tires adding 2 inches to diameter This yields a result of 916 RPMThis yields a result of 916 RPM

WeightWeight

Load assumed to be equal to 884.8lbfLoad assumed to be equal to 884.8lbf For simplification, force was considered a single force For simplification, force was considered a single force

along the bottom of rimalong the bottom of rim Equal and opposite force distributed along center and Equal and opposite force distributed along center and

in the bearing holesin the bearing holes

SupportsSupports

First Support (Left) – Simulates shaft wheel First Support (Left) – Simulates shaft wheel rests on, free to rotate axiallyrests on, free to rotate axially

Second Support (Right) – Simulates bolts Second Support (Right) – Simulates bolts holding rim on shaftholding rim on shaft

PressurePressure

A pressure along the inside of the tire A pressure along the inside of the tire was applied to account for the tire’s was applied to account for the tire’s inflated pressureinflated pressure

This pressure was assumed to be 40psiThis pressure was assumed to be 40psi

ResultsResults

Maximum Deformation: 6.759 x 10^-3 in. Minimum Deformation: 0

Maximum Stress: 3.437 x 10^3 psi Minimum Stress: 4.671 x 10^-1 psi

ImprovementsImprovements

Spokes Thickened From 0.69 in. to 1.25 in.Spokes Thickened From 0.69 in. to 1.25 in. Inner Rim Wall Thickened From 0.30 in. to 0.44 in.Inner Rim Wall Thickened From 0.30 in. to 0.44 in.

Before After

Improvement ResultsImprovement Results

Maximum Deformation: 3.123 x 10^-3 in.

Maximum Stress: 1.594 x 10^3 psi

Minimum Deformation: 0

Minimum Stress: 1.227 x psi

FatigueFatigueA356-T6 Fatigue Strength: 8700psi

Fatigue is responsible for about 90% of failures in metals. For a rim, this is detrimental. Fatigue occurs in a brittle fashion with no warning. There is very little, if any, plastic deformation that occurs. For a car to have the wheel fail could end in death.

Maximum Stress On Before Rim: 3437 psiMaximum Stress On After Rim: 1594 psi

SafetySafety

The rim has a The rim has a safety factor of safety factor of 15, which is 15, which is incredibly high incredibly high for industry for industry standards.standards.

ConclusionConclusion

Increasing the thickness of the spokes and inner walls Increasing the thickness of the spokes and inner walls helped to decrease maximum deformation and helped to decrease maximum deformation and maximum stress levels.maximum stress levels.

This improvement is very unnecessary, since the This improvement is very unnecessary, since the original rim already had the required levels for original rim already had the required levels for commercial use. However, most vehicles that use these commercial use. However, most vehicles that use these rims are heavy SUV’s which would need a stronger rim rims are heavy SUV’s which would need a stronger rim such as this. For racing application, the rim would need such as this. For racing application, the rim would need to be lighter, but was not the focus of this project.to be lighter, but was not the focus of this project.

If we were to build a wheel strictly for racing, we would If we were to build a wheel strictly for racing, we would decrease the amount of metal as much as possible as decrease the amount of metal as much as possible as long as the safety factors is no less than 2 and we would long as the safety factors is no less than 2 and we would use a material such as magnesium alloy instead of the use a material such as magnesium alloy instead of the aluminum alloy that is used for this rim.aluminum alloy that is used for this rim.

Maximum Deformation From 6.759 x 10^-3 in. to 3.123 x 10^-3 in.Maximum Stress Levels From 3437 psi to 1594 psi

ReferencesReferences http://www.matweb.com/search/http://www.matweb.com/search/

SpecificMaterial.asp?bassnum=MAC3560T6SSpecificMaterial.asp?bassnum=MAC3560T6S http://www.mse.mtu.edu/classes/my4130/http://www.mse.mtu.edu/classes/my4130/

databank/aluminum/a356.htmldatabank/aluminum/a356.html http://www.zenetti.com/html/2007/http://www.zenetti.com/html/2007/

index.php?index.php?section=wheels&wheelID=1&carID=section=wheels&wheelID=1&carID=

http://coewww.rutgers.edu/classes/mae/http://coewww.rutgers.edu/classes/mae/mae342/online_res/ANSYS%20Quickmae342/online_res/ANSYS%20Quick%20Start%20Tutorial.htm%20Start%20Tutorial.htm

http://autos.yahoo.com/http://autos.yahoo.com/nissan_350z_coupe_base-specs/?p=extnissan_350z_coupe_base-specs/?p=ext