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32_ch 08 Mechanical Design budynas_SM_ch08

# 32_ch 08 Mechanical Design budynas_SM_ch08 - 1(10 − 3 2...

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Chapter 8 235 Select a 3 8 " 24 UNF capscrew. The setting is given by T = (11 475 A t ) d = 1007 . 5(0 . 375) = 378 lbf · in Given the coarse scale on a torque wrench, specify a torque wrench setting of 400 lbf · in. Check the factor of safety n = 2 π f T 0 . 18 F x d = 2 π (0 . 12)(400) 0 . 18(1000)(0 . 375) = 4 . 47 8-48 Bolts: S p = 380 MPa, S y = 420 MPa Channel: t = 6 . 4 mm, S y = 170 MPa Cantilever: S y = 190 MPa Nut: H = 10 . 8 mm F A = F B = F C = F / 3 M = (50 + 26 + 125) F = 201 F F A = F C = 201 F 2(50) = 2 . 01 F F C = F C + F C = 1 3 + 2 . 01 F = 2 . 343 F Bolts: The shear bolt area is A = π (12 2 ) / 4 = 113 . 1 mm 2 S sy = 0 . 577(420) = 242 . 3 MPa F = S sy n A 2 . 343 = 242 . 3(113
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Unformatted text preview: . 1)(10 − 3 ) 2 . 8(2 . 343) = 4 . 18 kN Bearing on bolt: For a 12-mm bolt, at the channel, A b = td = (6 . 4)(12) = 76 . 8 mm 2 F = S y n ± A b 2 . 343 ² = 420 2 . 8 ³ 76 . 8(10 − 3 ) 2 . 343 ´ = 4 . 92 kN Bearing on channel: A b = 76 . 8 mm 2 , S y = 170 MPa F = 170 2 . 8 ³ 76 . 8(10 − 3 ) 2 . 343 ´ = 1 . 99 kN 26 152 B F' B F' A A M C F" A F' C F" C 50 50...
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