Q2. Two 35 mm shafts are connected by a flanged coupling The flanges are fitted with 6 bolts on 125 mm bolt circle. The shafts transmit a torque of 800 N-m at 350 rp.m. For the safe stresses mentioned below, calculate 1. diameter of bolts ; 2. thickness of flanges; 3. key dimensions; 4. hub length; and 5. power transmitted. Safe shear stress for shaft material = 63 MPa Safe stress for bolt material Safe stress for cast iron coupling Safe stress for key material = 56 MPa = 10 MPa = 46 MPa %3D

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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.