The connecting rod should be equally strong in

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Unformatted text preview: wn in Fig. 32.14 (a), with the following proportions : Flange and web thickness of the section = t Width of the section, B = 4t and depth or height of the section, H = 5t Fig. 32.14 First of all, let us find whether the section chosen is satisfactory or not. We have already discussed that the connecting rod is considered like both ends hinged for buckling about X-axis and both ends fixed for buckling about Y-axis. The connecting rod should be equally strong in buckling about both the axes. We know that in order to have a connecting rod equally strong about both the axes, Ixx = 4 Iyy where Ixx = Moment of inertia of the section about X-axis, and Iyy = Moment of inertia of the section about Y-axis. In actual practice, Ixx is kept slightly less than 4 Iyy. It is usually taken between 3 and 3.5 and the connecting rod is designed for buckling about X-axis. Now, for the section as shown in Fig. 32.14 (a), area of the section, A = 2 (4 t × t ) + 3t × t = 11 t2 Ixx = 1 419 4 4 t (5t )3 − 3t...
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