Stress versus rupture life data for a superalloy is listed below. The stresses are given in MPa…

Stress versus rupture life data for a superalloy is listed below. The stresses are given in MPa and rupture life is given in hours.

A. Make a plot of stress (log scale) versus PLM, where PLM = (T )(C + log10t).

T: is the temperature in kelvin, t: is in hours, and C = 20.

B. Predict from that plot what stress would cause rupture in 100,000 h at 450°C.

Stress / MPa

Rupture Time / h

500°C

600°C

700°C

800°C

600

2.8

0.018

0.0005

500

250.0

0.72

0.004

400

12.1

0.082

0.00205

300

180.0

0.87

0.011

200

2412.0

11.0

0.198

100

98.0

1.10

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