A turbine blade of solution annealed INCOLOY alloy 800 is 18 in long and operates at...

A turbine blade of solution annealed INCOLOY alloy 800 is 18 in long and operates at 1400 degrees Fahrenheit. If the tip clearance is 0.2 in and centrifugal forces induce an average longitudinal stress of 10 ksi. After how many hours is expected the blade to interfere with the turbine stator due to creep?

Expert Solution

Given that the working temperature = 1400^oF

The Tensile modulous of INCOLOY alloy 800 at the given temperature is given in below table.

Modulous = 21.06 x10³ ksi

Stress / Strain = 21.06 x10³ ksi

Longitudinal stress = 10 ksi

Strain = Stress / 21.06 x10³ = 10/ 21.06 x10³. =0.000475 inches per second

Given that the diameter is 18 inches

Gap is 0.2 inches

Centrifugal force acts both side we have to consider radial growth only

time to fill the gap = 0.2/ 0.000475 = 421.2 seconds= 7.02 min = 0.117 hours

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samet mamat answered 1 year ago

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