42_ch 03 Mechanical Design budynas_SM_ch03

42_ch 03 Mechanical Design budynas_SM_ch03 -...

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Unformatted text preview: budynas_SM_ch03.qxd 11/28/2006 21:22 FIRST PAGES Page 55 55 Chapter 3 (c) σθ /σ = 100 1 25 1 3 104 3 104 1+ 2 − 1+ cos 0 = − 2 4r 16 r 4 2 r2 16 r 4 r σθ /σ 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1.000 0.376 0.135 0.034 0.011 0.031 0.039 0.042 0.041 0.039 0.037 0.035 0.032 0.030 0.027 0.025 0.2 0 0.2 0.4 0.6 0.8 1.0 3-50 0 5 10 r (mm) 15 1.5 = 1.5 1 1/8 r /d = = 0.125 1 . K ts = 1.39 . K t = 1.60 D /d = Fig. A-15-8: Fig. A-15-9: σ A = Kt Mc 32(1.6)(200)(14) 32 K t M = = = 45 630 psi 3 I πd π (13 ) τ A = K ts σmax Tc 16(1.39)(200)(15) 16 K ts T = = = 21 240 psi 3 J πd π (13 ) σA = + 2 σA 2 2 45.63 + τA = + 2 2 45.63 2 = 54.0 kpsi Ans. τmax = 45.63 2 2 + 21.242 = 31.2 kpsi Ans. 2 + 21.242 20 ...
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