A shaft made of steel has the following minimum properties Se = 270 MPa, Sy = 423 MPa, and Sut = 527 MPa. The shaft is transmitting fixed torsional stress of 128 MPa and is subject to an alternating bending stress of 80 MPa. Find the factor of safety guarding against fatigue failure using Modified Goodman criterion. accepted answer range (+/- 0.2).

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Q: 4. The shaft shown below, is made of ASTM-A-36 steel with Sy = 250 MPa and p = 7.86 g/cm³. The…

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Q: Material property. This is the only data provided. Dont keep asking for material property.

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Q: D=45mm R2mm d=30mm Tx=80NM M=100NM Tx=320NM M=250NM

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Q: T M Figure 6 (b)

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Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.