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620 A bar of steel has the minimum properties

6-20 A bar of steel has the minimum properties Se=40 kpsi, Sy=60 kpsi, and Sut=80 kpsi. The bar is subjected to a steady torsional stress of 15 kpsi and analternating bending stress of 25 kpsi. Find the factor of safety guarding against a static failure, and either the factor of safety guarding against a fatiguefailure or the expected life of the part. For the fatigue analysis use:
(a) Modified Goodman criterion.

 

Jun 22 2020 View more View Less

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