How many cycles will the material tolerate at a stress, Mechanical Engineering

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How many cycles will the material tolerate at a stress

How many cycles will the material tolerate at a stress amplitude of +- 70MPa and zero mean stress? How will this change if the mean stress is 10 MPa? What if the mean stress is -10MPa? The tensile strength of the alloy is 200MPa.

sigma A = 480(Nf)^(-.12) = (delta sigma) / 2

sigma A = Stress Amplitude

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