Question: ( 3 ) A steel rotating - beam test specimen has an ultimate strength of 1 2 0 kpsi . Estimate the life of the

(3) A steel rotating-beam test specimen has an ultimate strength of 120 kpsi . Estimate the life of the specimen if it is tested at a completely reversed stress amplitude of 70 kpsi .(2 points)
( 3 ) A steel rotating - beam test specimen has

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