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Lightweight construction in the Formula Student Thimo Bielsky, Henrik Werner; e‐gnition Hamburg e.V. , e‐gnition‐[email protected] Material: Carbon Fiber Reinforced Plastic ‐ Sandwich Design goals: Torsional stiffness > 3000 Nm/deg Weight of 25 kg Coefficient 120 Nm/degkg From steel to CFRP Torsion load path Lay‐up optimization under torsional load Torsional rigidity at suspension points FEA & Optimization Substitution of iron and aluminum by GFRP‐ Sandwich Structural requirements: Vertical surface load of 20G / 7.5 kN Horizontal surface load of 40 G/ 15 kN Brake pedal: 1. iteration (left), 10. iteration under stress (right) Simulation of the gearbox (yellow) with its mounting brackets Resulsut of thr reanalysis with OSSmoth of the motor mounting Optimization of metal components Accumulator container with mesh for further simulations Force from the right, tension analysis Force from the right, displacement FEA & Optimization Glass fiber instead of metal 25 kg CFPR‐sandwich monocoque instead of a 40 kg steel frame Optimized accumulator container is 30 % lighter Total weight saved: 20 kg Weight reduction

Lightweight construction in the Formula Student · Displacement(Mag) Analysis system 5 A 15E±OO 3.979E400 3.410E4C0 2273E±00 1.705E400 1.137E4CO o coot-O Max = 5.1 Gnds 181680 Min

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Page 1: Lightweight construction in the Formula Student · Displacement(Mag) Analysis system 5 A 15E±OO 3.979E400 3.410E4C0 2273E±00 1.705E400 1.137E4CO o coot-O Max = 5.1 Gnds 181680 Min

Lightweight construction in the Formula StudentThimo Bielsky, Henrik Werner;  e‐gnition Hamburg e.V. , e‐gnition‐[email protected]

• Material: Carbon Fiber Reinforced Plastic ‐Sandwich

• Design goals:• Torsional stiffness > 3000 Nm/deg

• Weight of 25 kg• Coefficient 120 Nm/degkg

From steel to CFRP

Torsion load path

Lay‐up optimization under torsional load

Torsional rigidity at suspension points

FEA & Optimization

• Substitution of iron and aluminum by GFRP‐Sandwich 

• Structural requirements:• Vertical surface load of 20G / 7.5 kN

• Horizontal surface load of 40 G/ 15 kN

Brake pedal: 1. iteration (left), 10. iteration under stress (right)

Simulation of the gearbox (yellow) with its mounting brackets

Resulsut of thrreanalysis with OSSmoth of the motor mounting

Optimization of metal components

Accumulator container with mesh for further simulations

Force from the right, tension analysis

Force from the right, displacement

FEA & Optimization

Glass fiber instead of metal

• 25 kg CFPR‐sandwich monocoque instead of a 40 kg steel frame

• Optimized accumulator container is 30 % lighter

• Total weight saved: 20 kg

Weight reduction