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27_ch 14 Mechanical Design budynas_SM_ch14

27_ch 14 Mechanical Design budynas_SM_ch14 -...

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Chapter 14 375 Wear Table 14-8: C p = 1960 psi Table 14-7: 0 . 99 ( S c ) 10 7 = 75 000 psi = ( σ c , all ) P = ( σ c , all ) G W t 3 = ( σ c , all ) P C p 2 FdpI K o K v K s K m C f W t 3 = 75 000 1960 2 3 . 25(5 . 5)(0 . 1176) 1 . 25(1 . 534)(1)(1 . 24)(1) = 1295 lbf W t 4 = W t 3 = 1295 lbf H 4 = H 3 = 1295(1649) 33 000 = 64 . 7 hp Rating H rated = min(76 . 7, 94 . 4, 64 . 7, 64 . 7) = 64 . 7 hp Ans . Notice that the balance between bending and wear power is improved due to CI’s more favorable S c / S t ratio. Also note that the life is 10 7 pinion revolutions which is (1 / 300) of 3(10 9 ). Longer life goals require power derating. 14-31 From Table A-24 a , E a v = 11 . 8(10 6 ) For φ = 14 . 5 and H B = 156 S C = 1 . 4(81) 2 sin 14 . / [11 . 8(10 6
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