1. A steel hanger is bolted to a steel frame using two5/8 in-18 UNF grade 7 bolts. The thickness of thehanger at the bolt is identical to that of the frame,1 inch each. A vertical load varying between 0 and40,000 lb is applied at the hanger. The bolts areinitially tightened to 75% of its full proof load. Thelength of the bolt is two threads beyond the nut.Determine the factors of safety against yielding,overloading and joint separation, respectively. Also,estimate the torque required to develop the preload.FFor Problem 1, it is suspected that the fatigue life of the bolts is finite. After theaforementioned fluctuating load has been applied for 200,000 cycles, one decides to lowerthe load so that the bolts can have an infinite fatigue life. Suppose the stiffness constant ofthe joint has been adjusted to 0.2 (i.e., C= 0.2). Estimate the new endurance limit of the boltsafter 200,000 cycles of the fluctuating load applied, using the Minor rule and based on theGoodman criterion.

To find:The factors of safety against yielding, overloading, and joint separationGiven:Two UNF…

Answered: 1. A steel hanger is bolted to a steel…

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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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.
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