esign a muff coupling to connect shaft transmitting 40kw at 120rpm .the permissible  shear and crushing stresses for the shaft  and the key material are 30Mpa and 80Mpa respectively .the material for muff is cast iron with permissible shear stress is 15Mpa .assume that maximum torque transmitted is 25 percent greater than mean torque

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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.