The three cross-sections shown in Figure A12 have the same cross-sectiona area and are subjected to the same bending moment about their horizontal axis of symmetry. Section (a) is a square section. Sections (b) and (c) are composed of two rectangular sections that are placed loosely next to each other. If σå, σ and are their respective maximum bending stresses on the three sections, which one of the following relations is correct? 2a 2a 2a a a 2a (a) (b) а) ба<оо сос b) σa=0₂ < oc c) a< 0b = 0c d) a = b = c Figure A12 (c) Toro a a

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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.