(Answered) Fatigue testing of a metal alloy

Statistics

Fatigue testing of a metal alloy resulted in the S-N Curve:

N = 1.2 x 10^26 sigma^-7.2

Where N is the number of cycles to failure and sigma is the stress in MPa. The alloy is used in the design of an aircraft engine that under normal use will experience 120 cycles per second under a stress amplitude of 72.2 MPa. The typical engine will operate 450 hours per year. If the engine is being designed for a 12 year life, is this the right choice of material?

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