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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