Question 4.2: A steel rotor disc which is part of a turbine assembly has a...
A steel rotor disc which is part of a turbine assembly has a uniform thickness of 40 mm. The disc has an outer diameter of 600 mm and a central hole of 100 mm diameter. If there are 200 blades each of mass 0.153 kg pitched evenly around the periphery of the disc at an effective radius of 320 mm, determine the rotational speed at which yielding of the disc first occurs according to the maximum shear stress criterion of elastic failure occurs according to the maximum shear stress criterion of elastic failure. For steel, E = 200 GN/m^{2}, ν = 0.3, ρ = 7470 kg/m^{3} and the yield stress σ_{y} in simple tension = 500 MN/m^{2}
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