Two plates are clamped by a 3/4-10 UNC SAEGrade 5 bolt and regular nut with a 3/4-W plainwasher as shown in figure. Top plate is made ofgrey cast iron and bottom plate is steel. An axialforce of 12kN is acted upon the joint. Round offthe length of the bolt to nearest 1/4in. Assumebolts are preloaded to 75% of proof load.1. Determine the bolt stiffness kb.2. Determine the member stiffness km.3. Determine the yielding factor of safety of thebolt.4. Determine the load factor for the bolt.5. Determine the load factor guarding againstjoint separation.1.25 in1.00 in

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Answered: Two plates are clamped by a 3/4-10 UNC…

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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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
Mechanical design
What type of preloading system of ball screws is shown on the figure below? Tension Nut B Nut B Spacer Fao- Nut A Fao Tensile preload Compression Nut B Compressive preload Spacer Screw shaft Spacer Tension Screw shaft Nut A Compression Nut, A
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.
The figure illustrates the connection of a steel cylinder head to a grade 30 cast-iron pressure vessel using N bolts. A confined gasket seal has an effective sealing diameter D. The cylinder stores gas at a maximum pressure pg. For the specifications given in the table for the specific problem assigned, select a suitable bolt length from the preferred sizes in Table A–17, then determine the yielding factor of safety np, the load factor nL, and the joint separation factor n0. See problem number 8-36, and please use the FEA exponential curve-fit for member stiffness.
A joint is subject to a cyclic loading. There is an acceptable preload of 1,200 lbs, and the axial load is fully reversed with an amplitude of 1,600 lb. THe tensile bolt area is 0.160 in^2. Ignore any design factors and (take all nd=1) and assume the loads include the 1.2 bolt factor. If the joint constant is 0.25, the alternate and means axial stress for the bolt are: a) sa = 1,250 psi sm = 0 b) sa = 1,250 psi sm = 8,750 psi c) sa = 2,500 psi sm = 0 d) sa = 2,500 psi sm = 7,500 psi
Data: r=0.25 inch, d=0.4 pig and h=0.5 inch, wi=2.5 inch and w= 1.5 inch.The forces fluctuate between a tension of 14 Kips and a compression of 5 Kips. It is made of AISI 1018 CD. steel.The connecting element in the figure is failing. What is the most critical point and give recommendations to improve the situation.

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