!Required informationFor a bolted assembly with N = 6 bolts, the stiffness of each bolt is kb=1 Mlbf/in and the stiffness of the members is km =20 Mlbf/in per bolt. A repeated external load of W= 72 kips is applied to the entire joint. Assume the load is equallydistributed to all the bolts. It has been determined to use 1/2 in-13 UNC grade 8 bolts with rolled threads. Assume the boltsare preloaded to 75 percent of the proof load and the external load is a repeated load.Number of Bolts, NBolt Grade, GBolt Diameter, d6SAE 81/2 inDetermine the fatigue factor of safety for the bolts using the Goodman failure criterion.The fatigue factor of safety for the bolts using the Goodman failure criterion is

Stiffness of each bolt, kb=1 Mlbf/inStiffness of each member, km=20 Mlbf/in per boltExternal load,…

Answered: Required information For a bolted…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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For a bolted assembly, the stiffness of each bolt is ka = 700 MN/m and the stiffness of the members is km = 2100 MN/m per bolt. The joint is subject to occasional disassembly for maintenance and should be preloaded accordingly. An external load is applied to the entire joint with P = 360 kN. Assume the load is equally distributed to all the bolts. It has been determined to use M12x1.75 grade 8.8 bolts with rolled threads. (a) Determine the minimum number of bolts necessary to avoid yielding of the bolts. (b) Determine the minimum number of bolts necessary to avoid joint separation.
4 A double-threaded power screw with square threads pushes against a load of 3,641 N at a speed of 15 mm/s. The screw has a major diameter of 20 mm and a pitch of 3 mm. The frictional coefficient of the threads is 0.25, and collar friction is negligible. What is the rotational speed of the screw in units of revolutions per minute? Type your answer 2 points
RB&W11 recommends turn-of-nut from snug fit to preload as follows: 1/3 turn for bolt grips of 1-4 diameters, 1/2 turn for bolt grips 4-8 diameters, and 2/3 turn for grips of 8-12 diameters. These recommendations are for structural steel fabrication (permanent joints), producing preloads of 100 percent of proof strength and beyond. Machinery fabricators with fatigue loadings and possible joint disassembly have much smaller turns-of-nut. The RB&W recommendation enters the nonlinear plastic deformation zone. The figure shows a cross section of a grade 25 cast-iron pressure vessel, with a torque factor K of 0.09. Use Eq. (8-27) to estimate the torque necessary to establish the desired preload given that preload F;= 14.4 kip, bolt stiffness kb = 5.21 x 106 lbf/in, number of threads N=11, and material stiffness km = 8.95 × 106 lbf/in. in-11 UNCX 2 in grade 5 finished hex head bolt in in 162 No. 25 CI Determine the torque necessary to establish the desired preload and the turn of the nut in…
Design of a bolted assembly using a single M16x2 class 8.8 coarse-thread bolt has resulted in a joint where bolt stiffness is k, = 6 N/mm and the overall member stiffness - 18 N/mm. The fastener is to be reused (nonpermanent). Question 1 Value of joint stiffness constant: 0.25 4.0 0.5 0.1 Question 2 Magnitude of bolt tightening load (preload) Fi [kv]: 85 71 94 63
(P7-15) A certain application calls for a non- lubricated M36 x 4 ISO 8.8 threaded fastener to be torqued to 100% of proof load. Find this torque. At assembly, a cadmium-plated fastener was installed using the specified torque. What are the likely consequences of this error? T= T≤ 3385N-M = 673 mite
Required information For a bolted assembly with six bolts, the stiffness of each bolt is kb 2 Mibf/in and the stiffness of the members is km = 13 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. It is desired to find the range of torque that a mechanic could apply to initially preload the bolts without expecting failure once the joint is loaded. Assume a torque coefficient of K = 0.2. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Determine the maximum bolt preload that can be applied without exceeding the proof strength of the bolts once the load is applied. The maximum bolt preload that can be applied is Ibf.
Required information A solid square rod is cantilevered at one end. The rod is 0.6 m long and supports a completely reversing transverse load at the other end of ±1.7 kN. The material is AISI 1080 hot-rolled steel. If the rod must support this load for 5 x 104 cycles with a design factor of 1.5, what dimension should the square cross section have? Neglect any stress concentrations at the support end. What will the strength of the metal be at 5 x 104 cycles? The strength of the metal at 5 x 104 will be MPa.
A compression spring needed for a machine operation has to fit within a 1-in. diameter hole. To allow for some clearance, the outside diameter of the spring should not be larger than 0.9 in. To ensure a reasonable coil, use a spring index of 9. The spring will be repeatedly cycled from its free length of 3 in. to a length of 2 in. The solid length of the spring is 1 in. The spring should have squared ends and is to be made of music wire. (a) Determine a suitable wire diameter. (b) Determine a suitable number of coils. (c) Determine the spring rate. (d) Calculate the maximum shear stress the spring will experience during fatigue cycling. (e) Show on a stress vs. time plot how the fatigue cycling on the spring will occur. (f) If the spring is unpeened, what will be the shear endurance limit of the spring material in completely reversed cycling? (g) Can the spring survive a million fatigue cycles? Show by calculation.
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A rigid coupling with 30 inches of bolt circle diameter transmits a torque of 18,000 lb-in. The coupling material has a yield strength of 90,000 psi. The coupling is fastened by six bolts. Assume design factor of N=3 Calculate the diameter of each bolt.
A part is loaded with a combination of bending, axial, and torsion such that the following stresses are created at a particular location:Bending: Completely reversed, with a maximum stress of 60 MPaAxial: Constant stress of 20 MPaTorsion: Repeated load, varying from 0 MPa to 70 MPaAssume the varying stresses are in phase with each other. The part contains a notch such that Kf,bending = 1.4, Kf,axial = 1.1, and Kf,torsion = 2.0. The material properties are Sy = 300 MPa and Su = 400 MPa. The completely adjusted endurance limit is found to be Se = 160 MPa. Find the factor of safety for fatigue based on infinite life, using the Goodman criteria. If the life is not infinite, estimate the number of cycles, using the Walker criterion to find the equivalent completely reversed stress. Be sure to check for yielding.

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