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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
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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) Modified Goodman criterion.

(b) Gerber criterion.

(C) ASME-elliptic criterion.

User Andrew Ebling
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6.3k points

1 Answer

3 votes

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 = 1.315

Step-by-step explanation:

See the attached file for the calculation.

A bar of steel has the minimum properties Se = 40 kpsi, S = 60 kpsi, and S-80 kpsi-example-1
A bar of steel has the minimum properties Se = 40 kpsi, S = 60 kpsi, and S-80 kpsi-example-2
A bar of steel has the minimum properties Se = 40 kpsi, S = 60 kpsi, and S-80 kpsi-example-3
A bar of steel has the minimum properties Se = 40 kpsi, S = 60 kpsi, and S-80 kpsi-example-4
User Fazil Abdulkhadar
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