Estimate the fatigue strength of a rotating-beam

Estimate the fatigue strength of a rotating-beam specimen made of AISI 1020 hot-rolled steel corresponding to a life of 12.5 kilocycles of stress reversal. Also, estimate the life of the specimen corresponding to a stress amplitude of 36 kpsi. The known properties are Sut = 66.2 kpsi, σ0 = 115 kpsi, m = 0.22, and εf = 0.90.

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