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December 4, 2017
Alternative Materials for Roll Cage
Oscar Zamarron
Cody Chalmers
Tyler Johnson
Kyle Kramer
Charles Kirk
Underlying physics
● Roll cages protect occupants and stiffen chassis
● Material must have high strength/stiffness
● Must not be brittle at high impact loading
● Must minimize weight
● Forces used in FEA: 3000 lbf, and 5000 lbf
Merit Index and Ashby Methods
Materials
Material Density
(kg/m^3)
Modulus
(MPa)
Yield
Strength
(MPa)
Tensile
Strength
(MPa)
Titanium -6Al-4Sol treated and aged 4429 104,800 827 1050
Steel - AISI 4130 Steel, annealed at 865C 7850 205,000 460 560
Aluminum 6061-T4 (SS) 2700 69,000 228 240
Carbon Fiber 1430 102,000 727 1080
Steel - AISI 1020 7,900 352 352 421
Aluminum - 7075-T6 (SN) 2,810 72,000 505 570
Steel - Stainless (ferritic) 7,800 200,000 172 514
Results
● Best Choice - Carbon-fiber
reinforced composite
● 2nd Choice - Titanium
● Worst Choice - Aluminum
References
[1] “Road Crash Statistics.” ASIRT, asirt.org/initiatives/informing-road-users/road-
safety-facts/road-crash-statistics.
[2] Deutermann, William. “Characteristics of Fatal Rollover Crashes.”
crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/809438

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Alternative materials for roll cage

  • 1. 1 December 4, 2017 Alternative Materials for Roll Cage Oscar Zamarron Cody Chalmers Tyler Johnson Kyle Kramer Charles Kirk
  • 2. Underlying physics ● Roll cages protect occupants and stiffen chassis ● Material must have high strength/stiffness ● Must not be brittle at high impact loading ● Must minimize weight ● Forces used in FEA: 3000 lbf, and 5000 lbf
  • 3. Merit Index and Ashby Methods
  • 4. Materials Material Density (kg/m^3) Modulus (MPa) Yield Strength (MPa) Tensile Strength (MPa) Titanium -6Al-4Sol treated and aged 4429 104,800 827 1050 Steel - AISI 4130 Steel, annealed at 865C 7850 205,000 460 560 Aluminum 6061-T4 (SS) 2700 69,000 228 240 Carbon Fiber 1430 102,000 727 1080 Steel - AISI 1020 7,900 352 352 421 Aluminum - 7075-T6 (SN) 2,810 72,000 505 570 Steel - Stainless (ferritic) 7,800 200,000 172 514
  • 5. Results ● Best Choice - Carbon-fiber reinforced composite ● 2nd Choice - Titanium ● Worst Choice - Aluminum
  • 6. References [1] “Road Crash Statistics.” ASIRT, asirt.org/initiatives/informing-road-users/road- safety-facts/road-crash-statistics. [2] Deutermann, William. “Characteristics of Fatal Rollover Crashes.” crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/809438