PROBLEM 2 A part of a machine is subject to the following fluctuating stress of σmax...

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Mechanical Engineering

PROBLEM 2 A part of a machine is subject to the followingfluctuating stress of σmax = 55 kpsi and σmin = 20 kpsi applied for7 (104 ) cycles. If the load changes to σmax = 48 kpsi and σmin =-30 kpsi, how many cycles should the spring survive, using theGerber criterion? The material is AISI 1040 CD and has a fullycorrected endurance strength of Se = 27 kpsi. Assume that f = 0.9.Use Miner’s method.

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ANSWER The ultimate tensile stress for this steel isSut 85 kpsiWe have to find the maximum number of    See Answer
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