Lecture_Joining_Bolting_Static_Loading

Lecture_Joining_Bolting_Static_Loading - Bolting Design for...

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Bolting Design for Static Loading S Shaefer R. S. Shaefer MAE-162D University of California Los Angeles Winter 2011
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Outline • Bolting Standards • Design Rules of Bolted Joints • Stiffness Constant of a Member • Force Partitioning • Required Torque • Load (Safety) Factor • Gasketed Joints
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Bolting Standards ± Bolt heads: hexagonal , cap-screws (fillister heads), flat head (hexagonal socket head, machine screws (round, flat, fillister, oval, truss, binding, hex), hexagonal nuts washer face, chamfered on both sides, jam nuts). ( as e ace, c a e ed o bot s des, ja uts) ± Thread Length ( L T ) of inch-series bolts: T 1 2D + " L<6" 4 L= >6" L>6 1 " 2 for metric : T 2D +6 L < 125 mm, D < 48 L = 2D +12 125 L 200 ≤≤ 2D + 25 L > 200
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Bolting Standards ± Bolts are used for clamping, where the force is produced by twisting the nut. lamping force is called RE ENSION r bolt RE OAD Clamping force is called PRE-TENSION or bolt PRE-LOAD ± STUD : a rod threaded on both ends, screwed into a lower member frist, then a nut and washer is used on the other end ± Bolts are re-usable, but studs are permanent ± Grip: total thickness of the clamped material, including washers ± Spring or Stiffness Constant: Ratio between applied load and deflection
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Bolting Standards ± STIFFNESS CONSTANT ( k ): F k E δ = AE k F Fl l A E σ ε ⇒= = →= = Where A = area, E = Young’s Modulus, and l = length 111 1 1 : Series k k k k = ++++ pplication olt stiffness = threaded nthreaded parts in series 1234 : kk Parallel k k k k k =++++ Application Æ Bolt stiffness = threaded + unthreaded parts in series : t T t t Threaded Section k l A AE = : dt Bolt d td d d k A lA l Unthreaded Section k l = + =
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Bolting Standards ± PROOF Load : Maximum force for a bolt without acquiring a permanent set ROOF Strength: ± PROOF Strength: S u : ultimate strength proof strength =09S S y : corresponds 0.2% offset S p : proof strength 0.9 S y roof load proof load proof strength = tensile area
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This note was uploaded on 08/09/2011 for the course MAE 162D taught by Professor Shaefer during the Winter '11 term at UCLA.

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Lecture_Joining_Bolting_Static_Loading - Bolting Design for...

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