Dario Modirrousta-Galian.  French monks in the 11 th or 12 th century  Wooden tennis rackets.  Introduction of Carbon Fibre.  Popularity growth.

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Presentation transcript:

Dario Modirrousta-Galian

 French monks in the 11 th or 12 th century  Wooden tennis rackets.  Introduction of Carbon Fibre.  Popularity growth.

 Low density  Strong  Stiff  Hard

MATERIALDENSITYAVERAGE MASS OF TENNIS RACKET (grams) CARBON FIBRE STEEL WOOD (ASH)

Mass: 0.06kg Max Speed: 73m/s Contact time: 0.03s Return Shot: 73m/s Head Size: 0.082m 2 Racke t Ball Before04.38 After P= m × v P= 0.06 × 73 P= 4.38 P= m × v P= 0.06 × -73 P= Conservation of momentum Ball Before Ball after F=(Δmv) ⁄t F= 8.76/0.03 F≈300N P=N/m 2 300/0.082 = ≈ 3700Pa

Wood Metal Flexible

MATERIALYOUNG’S MODULUS (N/m 2 ) CARBON FIBRE530 × 10 9 STEEL200 × 10 9 WOOD (ASH)

CFRP= Carbon fibre reinforced polymer Costs per kg: £50-£75 Price of Racket: £25.50 (MAX)

Costs per kg: £5-£8 Price of Racket: £3.40 (MAX)

Costs per kg: £1-£7 Price of Racket: £2.80 (MAX)

Strong Covalent bonds require a lot of energy/force to break. These are very directional bonds.

Structure is in a cross-hatched style which makes it very tight. This makes it very useful for tennis rackets as it makes them very strong. Carbon Fibre under an electron microscope.

Head Size: 0.039m²-0.042m² Head Size:0.052m² m² Head Size: 0.077m²-0.087m² Maximum= 0.088m 2