Engineering, 25.04.2020 01:02 kydog00

A steel part is loaded with a combination of bending, axial, and torsion such that the following stresses are created at a particular location:

Bending: Completely reversed, with a maximum stress of 60 MPa

Axial: Constant stress of 20 MPa Torsion Repeated load, varying from 0 MPa to 70 MPa

Assume the varying stresses are in phase with each other.

The part contains a notch such that Kbending 14, Kaial 1.1, and Kmesion= 2.0. The material properties are 400 MPa. The completely adjusted endurance limit is found to be S 160 MPa.

а. Find the factor of safety for fatigue based on infinite life, using the Goodman criterion.

b. If the life is not infinite, estimate the number of cycles, using the Walker criterion to find the equivalent completely reversed stress. Be sure to check = = 300 MPa and S for yielding.

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A steel part is loaded with a combination of bending, axial, and torsion such that the following str...

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