3 422 53 476 2 2 taking ve sign or t 69 say

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Unformatted text preview: gth of the connecting rod for both ends hinged, L = l = 380 mm Now according to Rankine’s formula, we know that buckling load (WB), r= 148 440 = σc . A L 1 + a k xx 2 ...(Given) 320 × 11 t 2 = 2 1 380 7500 1.78 t ... (It is given that σc = 320 MPa or N/mm2 and a = 1 / 7500) 1+ 148 440 11 t 2 11 t 4 = =2 320 6.1 t + 6.1 1+ 2 t 464 (t 2 + 6.1) = 11 t 4 t – 42.2 t 2 – 257.3 = 0 4 or ∴ t2 = 42.2 ± (42.2) 2 + 4 × 257.3 42.2 ± 53 = 47.6 = 2 2 ... (Taking +ve sign) or t = 6.9 say 7 mm Thus, the dimensions of I-section of the connecting rod are : Thickness of flange and web of the section = t = 7 mm Ans. Width of the section, B = 4 t = 4 × 7 = 28 mm Ans. and depth or height of the section, H = 5 t = 5 × 7 = 35 mm Ans. Piston and connecting rod. 1158 n A Textbook of Machine Design These dimensions are at the middle of the connecting rod. The width (B) is kept constant throughout the length of the rod, but the depth (H) varies. The depth near the big end or crank end is kept as 1.1H to 1.25H and the depth near the small end or piston end or pis...
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This note was uploaded on 09/30/2012 for the course MECHANICAL 403 taught by Professor A.thirumoorthy during the Spring '11 term at Anna University Chennai - Regional Office, Coimbatore.

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