/n/n/n/n Engineering Materials MECH1280 PFi Laboratory 2 telegraph.co.uk Lab Design Brief • A new local mini go-karting company are building a make-shift outdoor track for kids (aged between 7- 10 years). They need a safety barrier around the track perimeter that is 10 metres away from the track. The barrier would need to be able to absorb energy from an impacting kart, must withstand loads of up to 1 kN before failure and impact speeds of up to 10 km/h. Each barrier section must be no higher than 0.5 m and 1 m in length. The company would like to know what the most suitable material is for their application. Note: that this is a commercial company that wants to appeal to as many customers as possible. Plywood Testing Materials Carbon fibre/foam sandwich panel Medium Density Fibreboard (MDF) Material Information Material Density, E G V Tensile Economic P strength cost Plywood 500-600 ? kg/m³ ? 0.25 ? ₤10/m² Carbon fibre-foam panel unknown ? ? unknown? £204/ m² Medium density 700-800 ? ? 0.25 ? £17.5/ m² fibreboard kg/m³ (MDF) Note: R not constant! Three Point Bending F I = bd³ d 12 L/2 R L F δ == FL³ 48EI S 3FL Ofs = 2bd2 ↑ ↑Y वाम Neutral axis ------ Ef = 6d8 L²/n