5_ch 08 Mechanical Design budynas_SM_ch08

5_ch 08 Mechanical Design budynas_SM_ch08 - + 1 4 = 2(0 ....

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208 Solutions Manual • Instructor’s Solution Manual to Accompany Mechanical Engineering Design (d) l + H = 1 . 109 + 0 . 4375 = 1 . 5465 in This would be rounded to 1.75 in per Table A-17. The bolt is long enough. Ans. (e) l d = L L T = 1 . 75 1 . 25 = 0 . 500 in Ans. l t = l l d = 1 . 109 0 . 500 = 0 . 609 in Ans. These lengths are needed to estimate bolt spring rate k b . Note: In an analysis problem, you need not know the fastener’s length at the outset, although you can certainly check, if appropriate. 8-12 (a) L T = 2 D + 6 = 2(14) + 6 = 34 mm Ans. (b) From Table A-33, the maximum washer thickness is 3.5 mm. Thus, the grip is, l = 14 + 14 + 3 . 5 = 31 . 5mm Ans. (c) From Table A-31, H = 12 . 8mm (d) l + H = 31 . 5 + 12 . 8 = 44 . 3mm Adding one or two threads and rounding up to L = 50 mm. The bolt is long enough. Ans. (e) l d = L L T = 50 34 = 16 mm Ans. l t = l l d = 31 . 5 16 = 15 . 5mm Ans. These lengths are needed to estimate the bolt spring rate k b . 8-13 (a) L T = 2 D
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Unformatted text preview: + 1 4 = 2(0 . 5) + . 25 = 1 . 25 in Ans. (b) l > h + d 2 = t 1 + d 2 = . 875 + . 5 2 = 1 . 125 in Ans. (c) L > h + 1 . 5 d = t 1 + 1 . 5 d = . 875 + 1 . 5(0 . 5) = 1 . 625 in From Table A-17, this rounds to 1.75 in. The cap screw is long enough. Ans. (d) l d = L L T = 1 . 75 1 . 25 = . 500 in Ans. l t = l l d = 1 . 125 . 5 = . 625 in Ans. 8-14 (a) L T = 2(12) + 6 = 30 mm Ans. (b) l = h + d 2 = t 1 + d 2 = 20 + 12 2 = 26 mm Ans. (c) L > h + 1 . 5 d = t 1 + 1 . 5 d = 20 + 1 . 5(12) = 38 mm This rounds to 40 mm (Table A-17). The fastener is long enough. Ans. (d) l d = L L T = 40 30 = 10 mm Ans. l T = l l d = 26 10 = 16 mm Ans....
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