25 lt 2 db 050 l 6in l 6in stresses in threaded region

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Unformatted text preview: r (inch), n] MF 6X1 [db.. bolt diameter (mm), pitch] •  •  •  •  •  Leff … effec?ve load carrying length (grip) Lub … unthreaded length Lt … threaded length Lth … threaded length in grip H … nut height Lub = L  ­ Lt Lth = Leff – Lub Choose L: L > Leff + H Choose H: H > 0.5db to avoid stripping Standard sizes For metric (in mm) For inch series Ⱥ 2 db + 6 L ≤ 125 Ⱥ Lt = Ⱥ2 db + 12 125 < L ≤ 200 Ⱥ L > 200 Ⱥ 2 db + 25 € € Ⱥ 2 db + 0.25 Lt = Ⱥ Ⱥ 2 db + 0.50 L ≤ 6in L > 6in Stresses in threaded region –  In engaged region (where threads are “meshed”) •  Shear stress to strip thread (along axis of bolt) τ tr = € 3Fb 2A τ tr = 3Fb πdr pn e 1 A = πdr pn e 2 # engaged threads that carry load € •  Bending stress at root of tooth € σb = 12 Fb ( d p − dr ) πdr n e p 2 –  In grip (tensile...
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This note was uploaded on 05/05/2012 for the course MANE 4030 taught by Professor Lucyzhang during the Spring '12 term at Rensselaer Polytechnic Institute.

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