You are in the design department of a major turbine engine supplier. During testing, they find that an experimental Partially Stabilized Zirconia rotor disk fails at 1200 MPa. (a) Determine the surface crack size that must have been present to cause this failure (take the Geometric factor as 1.12 for the disk). (b) If a 40 cm diameter ring (with a 4 cm diameter center hole) that is 10 cm thick, that is to be used as a turbine disk, is subjected to a cross-sectional loading of 18900 Newtons due to spinning of the turbine in normal operation — and the company can detect internal flaws of 0.25mm — would you expect that a plan could be developed to ship only good disks to your customers? That is, the company after non-destructive testing will only ship disks that won’t fail when loaded during operation?

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