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# 3213 a we find that area of the section fig 3213 i

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Unformatted text preview: 3.5 and the connecting rod is designed for bucking about X-axis. The design will always be satisfactory for buckling about Y-axis. The most suitable section for the connecting rod is I-section with the proportions as shown in Fig. 32.13 (a). Let thickness of the flange and web of the section = t Width of the section, B = 4 t and depth or height of the section, H = 5t From Fig. 32.13 (a), we find that area of the section, Fig. 32.13. I-section of connecting rod. A = 2 (4 t × t) + 3 t × t = 11 t2 Moment of inertia of the section about X-axis, 1 419 4 3 3 Ixx = 12 4 t (5t ) − 3t (3t ) = 12 t and moment of inertia of the section about Y-axis, 1 1 131 4 (3t ) t 3 = t × (4 t ) 3 + t Iyy = 2 × 12 12 12 ∴ I xx 419 12 = × = 3.2 12 131 I yy I xx lies between 3 and 3.5, therefore, I-section chosen is quite satisfactory. I yy After deciding the proportions for I-section of the connecting rod, its dimensions are determined by considering the buckling of the rod about X-axis (assuming both ends hinged) and applying the Rankine’s formula. We know that buckling load,...
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