The bolt shown in the following figure is a 5/8 in - 18 UNF grade 5 bolt. The bolt and the clamped plates are of the same length. Assume that the threads stop immediately above the nut. The clamped steel plates have a stiffness "k." four times the bolt stiffness "k". The load fluctuates continuously between 0 and 9,000 lb. (a) Find the minimum required value of initial preload to prevent loss of compression of the plates. (b) Find the minimum force in the plates for the fluctuating load when the preload is 10,000 lb. (c) Based on the initial preload calculated in part “a”, what is the torque requirement for the 5/8 in 18 UNF grade 5 bolt when it is initially assembled? (i.e. What torque needs to be applied to the bolt to achieve the initial preload? Assume the nut is held fixed and the bolt is turned into the nut.) Use μμ₁ = 0.15 and d₁ = 1.5d. Fe Fe 0 To 9,000 lb k₁ = 4kb Fe Ans. (Part a) Fimin = 7200 lb, Ans. (Part b) Fo_min=2800 lb, Ans. (Part c) T = 78.38 ft lb
The bolt shown in the following figure is a 5/8 in - 18 UNF grade 5 bolt. The bolt and the clamped plates are of the same length. Assume that the threads stop immediately above the nut. The clamped steel plates have a stiffness "k." four times the bolt stiffness "k". The load fluctuates continuously between 0 and 9,000 lb. (a) Find the minimum required value of initial preload to prevent loss of compression of the plates. (b) Find the minimum force in the plates for the fluctuating load when the preload is 10,000 lb. (c) Based on the initial preload calculated in part “a”, what is the torque requirement for the 5/8 in 18 UNF grade 5 bolt when it is initially assembled? (i.e. What torque needs to be applied to the bolt to achieve the initial preload? Assume the nut is held fixed and the bolt is turned into the nut.) Use μμ₁ = 0.15 and d₁ = 1.5d. Fe Fe 0 To 9,000 lb k₁ = 4kb Fe Ans. (Part a) Fimin = 7200 lb, Ans. (Part b) Fo_min=2800 lb, Ans. (Part c) T = 78.38 ft lb
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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Transcribed Image Text:The bolt shown in the following figure is a 5/8 in - 18 UNF grade 5 bolt. The bolt and the clamped
plates are of the same length. Assume that the threads stop immediately above the nut. The
clamped steel plates have a stiffness "k." four times the bolt stiffness "k". The load fluctuates
continuously between 0 and 9,000 lb.
(a) Find the minimum required value of initial preload to prevent loss of compression of the plates.
(b) Find the minimum force in the plates for the fluctuating load when the preload is 10,000 lb.
(c) Based on the initial preload calculated in part “a”, what is the torque requirement for the 5/8 in
18 UNF grade 5 bolt when it is initially assembled? (i.e. What torque needs to be applied to the
bolt to achieve the initial preload? Assume the nut is held fixed and the bolt is turned into the
nut.) Use μμ₁ = 0.15 and d₁ = 1.5d.
Fe
Fe 0 To 9,000 lb
k₁ = 4kb
Fe
Ans. (Part a) Fimin = 7200 lb, Ans. (Part b) Fo_min=2800 lb, Ans. (Part c) T = 78.38 ft lb
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