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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