A nickeltitanium alloy is used to make components for jet tu

A nickel-titanium alloy is used to make components for jet turbine aircraft engines. Cracking is a potentially serious problem in the final part because it can lead to nonrecoverable failure. A test is run at the parts producer to determine the effects of four actors on cracks. The four factors are pouring temperature (A), titanium content (B), heat treatment method (C), and amount of grain refiner used (D). Two replicates of a 2^4 design are run, and the length of crack (in mm x 10^-2) induced in a sample coupon subjected to a standard test is measured. The data are shown below Estimate the factor effects. Which factor effects appear to be large? Conduct an analysis of variance. Do any of the factors affect cracking? Use a = 0.05. What recommendations would you make regarding process operations? Use interaction and/or main effect plots to assist in drawing conclusions. What set of conditions would you recommend for the factors A, B, and D if you use heat treatment method C=+?

Solution

a.)

From the above given result sheet,we can can conclude the order of effects of various factors

A>B>C>D

c.)

   As, A factor is most effective,pouring temperature needs to be regulated and checked regularly.

Also ,B factor is 2nd most effective, titanium content in alloy should be uniform and checked regularly

D.)

If proper heat treatment method is employed,then factor C will be eliminated more,however other factors may not be totally solved