15.17 (B). A circular shaft, 100 mm diameter is subjected to combined bending moment and torque, the bendingmoment being 3 times the torque. If the direct tension yield point of the material is 300 MN/m2 and the factor ofsafety on yield is to be 4, calculate the allowable twisting moment by the three following theories of failure:(a) Maximum principal stress theory(b) Maximum shear stress theory(c) Maximum shear strain energy theory.[U.L.] [2.86, 2.79, 2.83 kNm]

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15.17 (B). A čircular shaft, moment being 3 times the torque. If the direct tension safety on yield is to be 4, calculate the allowable twis (a) Maximum principal stress theory (b) Maximum shear stress theory (c) Maximum shear strain energy theory.

15.17 (B). A čircular shaft, moment being 3 times the torque. If the direct tension safety on yield is to be 4, calculate the allowable twis (a) Maximum principal stress theory (b) Maximum shear stress theory (c) Maximum shear strain energy theory.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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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

15.17 (B). A circular shaft, 100 mm diameter is subjected to combined bending moment and torque, the bending
moment being 3 times the torque. If the direct tension yield point of the material is 300 MN/m2 and the factor of
safety on yield is to be 4, calculate the allowable twisting moment by the three following theories of failure:
(a) Maximum principal stress theory
(b) Maximum shear stress theory
(c) Maximum shear strain energy theory.
[U.L.] [2.86, 2.79, 2.83 kNm]

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