FEA Analysis

Maria Krutikovawith contributions from Teal Dowd

Background Information

Assumptions

Fixed rear, twist chassis about a fixed point

The Equations

𝐾=𝑃 (𝐿1+2𝐿2 )

tan−1( ∆𝐴

𝐿𝐴)𝑜𝑟 tan−1( ∆𝐵𝐿𝐵

)𝑜𝑟 tan−1( ∆𝐶𝐿𝐶)𝑜𝑟 tan−1( ∆𝐷

𝐿𝐷)

L

θΔ

Torsional Stiffness = Torque per degree

2014 Analysis

Meshed 2014 Chassis

Assumption: all tubes are 1”x .049” thickness!

Total Deformation

Directional Deformation Y-Axis

Maximum Stress

Max Stress significantly under ultimate tensile stressFactor of Safety = 3.5

𝐾=𝑃 (𝐿1+2𝐿2 )

tan−1( ∆𝐴

𝐿𝐴)𝑜𝑟 tan−1( ∆𝐵𝐿𝐵

)𝑜𝑟 tan−1( ∆𝐶𝐿𝐶)𝑜𝑟 tan−1( ∆𝐷

𝐿𝐷)

𝐾=500 (33 )

tan−1( .1148.25 )

𝐾=1736𝑙𝑏∗ 𝑓𝑡𝑑𝑒𝑔

Torsional Stiffness

2015 Analysis

2015 Chassis

Assumption: all tubes are 1”x .049” thickness!

Loads and Boundary Conditions

Total Deformation

Directional Deformation Y-Axis

Maximum Stress

Max Stress significantly under ultimate tensile stressFactor of Safety = 2.5

𝐾=𝑃 (𝐿1+2𝐿2 )

tan−1( ∆𝐴

𝐿𝐴)𝑜𝑟 tan−1( ∆𝐵𝐿𝐵

)𝑜𝑟 tan−1( ∆𝐶𝐿𝐶)𝑜𝑟 tan−1( ∆𝐷

𝐿𝐷)

𝐾=500 (33 )

tan−1( .1128.25 )

𝐾=1768𝑙𝑏∗ 𝑓𝑡𝑑𝑒𝑔

Torsional Stiffness