A thin strip of steel of length L = 0.8 m and thickness t = 2 mm is bent by couples Mo (see figure). The deftection b at the midpoint of the strip (measured from a line joining its . end points) is found to be 143 mm. (a) Calculate the radius of curvature ρ of the strip. (b) Assuming that the neutral surface is equidistant from the top and bottom surfaces of the strip, calculate the longitudinal normal strain E at the top surface of the strip.

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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.