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# 97 t 3 1397 73 4792 mm3 5t 2 12 5t maximum bending

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Unformatted text preview: connecting rod (i.e. whipping stress). We know that mass of the connecting rod per metre length, m1 = Volume × density = Area × length × density = A × l × ρ = 11t2 × l × ρ ...(∵ A = 11t2) = 11(0.0007)2 (0.38) 8000 = 1.64 kg ...[∵ ρ = 8 000 kg /m3 (given)] ∴ Maximum bending moment, Mmax = m . ω2 . r × l 93 = m1 . ω2 . r × l2 93 ...(∵ m = m1· l) 2 (0.38)2 2π × 1800 1.64 (0.095) = 51.3 N-m = 60 93 = 51 300 N-mm and section modulus, Z xx = 419 t 4 2 I xx = × = 13.97 t 3 =13.97 × 73 = 4792 mm3 5t / 2 12 5t ∴ Maximum bending stress (induced ) due to inertia bending forces or whipping stress, σb (max) = M max 51 300 = = 10.7 N / mm2 4792 Z xx Since the maximum bending stress induced is less than the allowable bending stress of 80 N mm2, therefore the design is safe. Internal Combustion Engine Parts n 1161 32.16 Crankshaft A crankshaft (i.e. a shaft with a crank) is used to convert reciprocating motion of the piston into rotatory motion or vice versa. The crankshaft...
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