Problem 7.2: A 2-in steel plate and a 1-in cast-iron plate are to be compressed with one bolt and nut. Specify a UNC bolt to provide a joint constant C of approximately 0.2.
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- 3. An M16 x 2 bolt with a slotted hex nut is used to clamp together two 25 mm steel plates. The joint is assembled with a size 16 N washer underneath the bolt head. The bolt is a 5.8 class metric grade, with a proof strength of 380 MPa. The joint is intended to be permanent. Determine a suitable length for the bolt, rounded up to the nearest standard size in millimeters. Calculate the bolt stiffness, the elongation of the bolt after the necessary preload is developed, and the bolt torque required to apply the preload. Assume that coefficients of friction between the bolt, nut, and collar are all ~0.15. For steel, use E = 207 GPa. Standard threaded fastener lengths, dimensions of hexagonal nuts, and dimensions of metric plain washers are provided in the textbook appendices.M16 x 2.0 ISO 5.8 coarse series bolts and nuts clamp a 26-mm-thick steel cover plate to a 6-mm-thick steel flange. Steel washers (Size: 16R) are used under the head of the bolt and also under the nut . Assume E = 207 GPa- (a) Determine a suitable length for the bolt, rounded up to the nearest 5 mm. (b) Determine the bolt stiffness. (c) Determine the stiffness of the members. (d) Determine the stiffness of the joint.Problem 3: A Hexagonal bolt connects two members. The joint has a gap 1 = 2 in and the applied load is 2000 lb. Both of the clamped parts are steel. A preload of 90% the bolt's proof strength will be applied first. For this design, an SAE grade 1, 5/16"-18 UNC-2A bolt is chosen made from A307 with rolled threads. Washers are included between the head and the joint, and between the nut and the joint. Determine a suitable length for the bolt? Find its safety factor against yielding and against joint separation. Are these values acceptable?
- A light standard for a highway is shown in figure 6.52. Although it is made entirely of welded aluminum, the member ABC is presumed to be continuous and pin connected at B and C. According to this conservative assumption, what is the tension force in the strut at B? Neglect the weight of the aluminum members.A link in a mechanism for an automated packag- ing machine is subjected to a direct tensile force of 1720 lb, repeated many times. The link is square, 0.40 in. on a side. Specify a suitable steel for the 3-3. link.1. For a bolted assembly with six bolts, the stiffness of each bolt is k, = 3 Mlbf/in and the stiffness of the members is km = 12 Mlbf/in per bolt. An external load of 80 kips is applied to the entire joint. Assume the load is equally distributed to all the bolts. It has been determined to use 1/2 in-13 UNC grade 8 bolts with rolled threads. Assume a torque co-efficient of K = 0.2. a. Determine the maximum bolt preload that can be applied without exceeding the proof strength of the bolts. b. Determine the minimum bolt preload that can be applied while avoiding joint separation. c. Determine the value of torque in units of Ibf-ft that should be specified for preloading the bolts if it is desired to preload to 75% of the proof load. d. Determine the yielding factor of safety for part c). (based on proof strength)
- Calculate the maximum tensile stress developed in a 1/4-20 bolt (Major dia = 0.2500" and Root dia = 0.1959"), 3" long, and a head height of 0.1875", if it is subjected to a load of 426 lbs.Calculate external support reactions, forces of internal joints and draw FBD of assemblyProblem 7: Analyse to determine the maximum service tensile live load force that can be supported by a pair of angles 2Ls 152x102x19, shown in the accompanying figure, if 4709M, Grade 345 steel and the AISC LRFD specifications are used. The live load is to be 3/2 times the dead load. The holes are drilled for 18mm rivets at standard gage distances.
- Two identical aluminum plates are each 3 in thick, and are compressed with one bolt and nut. Washers are used under the head of the bolt and under the nut. Washer properties: steel; ID = 0.531 in; OD = 1.062 in; thickness = 0.095 in Nut properties: steel; height = 7/16 in Bolt properties: 1/2 in-13 UNC grade 8 Plate properties: aluminum; E = 10.3 Mpsi; Su = 47 kpsi; Sy = 25 kpsi (a) Determine a suitable length for the bolt, rounded up to the nearest 1/4 in. (b) Determine the bolt stiffness. (c) Determine the stiffness of the members.The figure gives the cross-section of a grade 25 cast-iron pressure vessel. A total of N bolts are to be used to resist a separating force of 150 kN. (a) Determine kb, km, and C. (b) Find the number of bolts required for a load factor of 2 where the bolts may be reused when the joint is taken apart. (c) With the number of bolts obtained in part (b), determine the realized load factor for overload, the yielding factor of safety, and the load factor for joint separation. Use (SI) units as it applies34 in 3. The following data apply to the C-clamp: a. The screw is ACME with ¾" Diameter b. Coefficient of thread friction = 0.12 c. Coefficient of collar friction = 0.23 d. Mean collar radius = 0.55 in. e. Max. clamping force = 1000 lb Determine: The tightening torque The operator force at the end of the handle (Note: Use table 8-3 to determine the screw pitch (p))
