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In a certain situation steel has an SNcurve described by the equation A=NSmwhere Sis the cycle stress range, Nis the number of cycles to failure, A=1.011015,m=4a. Suppose that a steel wind turbine component experiences Ni=5107cycles and that the stress range is constant at 60MPa, what is the total damage? Will the component fail? b. Suppose the 5107stress range cycles are Weibull distributed, the mean stress level is =60MPaand k=8. What is the total damage?

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Will the component fail?