A Torque of 3000 (ft-Ibf) is applied to a shaft made from structural steel (ASTMA36, Øy = 36 ksi, ty = 21 ksi). Determine the maximum stress in the shaft if it has a diameter of three inches. What is the factor of safety for this shaft?

A Torque of 3000 (ft-Ibf) is applied to a shaft made from structural steel (ASTMA36, Øy = 36 ksi, ty = 21 ksi). Determine the maximum stress in the shaft if it has a diameter of three inches. What is the factor of safety for this shaft?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

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.

Question

A Torque of 3000 (ft-lbf) is applied to a shaft made from structural steel (ASTMA36, gy =
36 ksi, ty = 21 ksi). Determine the maximum stress in the shaft if it has a diameter of
three inches. What is the factor of safety for this shaft?

16T
Note: for a circular shaft in pure torsion, T =
nd³ *
where t is the shear stress on the outer wall of the shaft, T is torque, and d is the
diameter of the shaft.

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