Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 30 Dec 2017 My Price 7.00

Larson-Miller plot

Construct a Larson-Miller plot using the following creep rupture data, assuming C = 20.

a. Plot the data twice: (i) with axes of Stress vs. the LM parameter in thousands of hours, and (ii) with axes of Log(Stress) vs. the LM parameter in thousands of hours. Fit a second-order polynomial to the second plot.

b. Using your fitted line, determine the expected life for a sample tested with a stress of 240 MPa at 650°C, and with a stress of 35 MPa at 870°C. (This may be easiest if you add a curve to the first plot based on the polynomial fit to the log(stress) data.)

c. What is the maximum operational temperature such that failure should not occur in 5000 hr at stress levels of 140 and 420 MPa, respectively?

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Maurice Tutor
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Status NEW Posted 30 Dec 2017 09:12 PM My Price 7.00

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