The blades of a turbine rotor are fitted into aluminium alloy discs on the rotor as...
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The blades of a turbine rotor are fitted into aluminium alloy discs on the rotor as shown in Figure 8.2. If during the assembly of the system a 0.1 mm deep scratch is made in the surface of the disc as indicated, (a) calculate how many stress cycles the disc can withstand before fatigue failure occurs and (b) if the rotor is required to undergo at least 2000 cycles in service, by what factor should the rotation speed be increased in a test to verify that any cracks in the disc are too small to grow to a critical size in service? You are given stress in a rotating disk is proportional to (angular velocity). The rotation of the turbine causes a stress of 350 MN/m2 in the plane of the scratch and the crack growth data for the disc material is given in Figure 8.1b. Blede Diec Crack Turbine motor 10-3 10-5 de 10-7 10-9 10-11l 1 AKTH 10 100 AK (MN m) Figure 8.1b * (m/cycle) The blades of a turbine rotor are fitted into aluminium alloy discs on the rotor as shown in Figure 8.2. If during the assembly of the system a 0.1 mm deep scratch is made in the surface of the disc as indicated, (a) calculate how many stress cycles the disc can withstand before fatigue failure occurs and (b) if the rotor is required to undergo at least 2000 cycles in service, by what factor should the rotation speed be increased in a test to verify that any cracks in the disc are too small to grow to a critical size in service? You are given stress in a rotating disk is proportional to (angular velocity). The rotation of the turbine causes a stress of 350 MN/m2 in the plane of the scratch and the crack growth data for the disc material is given in Figure 8.1b. Blede Diec Crack Turbine motor 10-3 10-5 de 10-7 10-9 10-11l 1 AKTH 10 100 AK (MN m) Figure 8.1b * (m/cycle)
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