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A bar of steel has the minimum properties Se = 40 kpsi, S = 60 kpsi, and S-80 kpsi. The bar is subjected to a steady torsional stress of 15 kpsi and an alternating bending stress of 25 kpsi Find the factor of safety guarding against a static failure, and either the factor of safety guard- ing against a fatigue failure or the expected life of the part. For the fatigue analysis use:
A bar of steel has the minimum properties Se = 40 kpsi, S = 60 kpsi, and S-80 kpsi. The bar is subjected to a steady torsional stress of 15 kpsi and an alternating bending stress of 25 kpsi Find the factor of safety guarding against a static failure, and either the factor of safety guard- ing against a fatigue failure or the expected life of the part. For the fatigue analysis use: (a) Modified Goodman criterion.
(b) Gerber criterion.
(C) ASME-elliptic criterion.
Answer:(a) Modified Goodman criterion:Factor of safety against fatigue failure = 1.0529(b) Gerber criterion:Factor of safety against fatigue failure = 1.31(c) ASME-elliptic criterion:Factor of safety against fatigue failure = 1.315Explanation:See the attached file for the calculation....
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