For a bolted assembly, the stiffness of each bolt is ka = 700 MN/m and the stiffness of themembers is km = 2100 MN/m per bolt. The joint is subject to occasional disassembly formaintenance and should be preloaded accordingly. An external load is applied to the entirejoint with P = 360 kN. Assume the load is equally distributed to all the bolts. It has beendetermined 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.

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Answered: For a bolted assembly, the stiffness of…

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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Table 7-1 11) Determine the available tension capacity (LRFD) of the connection with A36 steel plates. Fy 36 ksi, F. = 58 ksi, U=1. Assume the bearing capacity is adequate. Available Shear Strength of Bolts, kips Nominal Bolt Diameter, d, in. Nominal Bolt Area, in.2 1.23 14 in x 1 in. R 中 Desig- Thread (ksi) | (ksi) Load- Ta ing ASD LRFD nation Cond. ASD LRFD (11) S 33.2 66.4 49.8 27.0 40.5 Group D. 99.6 41.8 62.7 34.0 51.0 D. 83.6 125 41.8 62.7 34.0 51.0 Group 83.6 125 9.5 in x 4 in. P S 51.7 77.5 155 42.0 63.0 4-1 in. A325 N bolts (Group A) (138 in. hole size) 103
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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. Determine the endurance limit for this application. Assume that the size modification factor kis 0.85 until a size for the section is known. The endurance limit is 278.4 MPa.
A circular bar of "500" mm length is supported freely at its two ends. It is acted upon by a central concentrated cyclic load having a minimum value of 20 kN and a maximum value of 50 kN. Take a factor of safety of 1.5, size effect of 0.85, and a surface finish factor of 0.9. The material properties of bar are given as ultimate strength of "605" MPa, yield strength of "540" MPa and endurance strength of "350" MPa. Determine the diameter of bar by using Goodman's method and Soderberg method.
Find the distance ( mm ) measurement between preload and major load position of the Rockwell Hardness Number 50HRC
Bolt properties: M12 x1.75 ISO 5.8 (a) Determine a suitable length for the bolt, use preferred size. (b) Determine the bolt stiffness. (c) Determine the stiffness of the members.
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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

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