Two 3/8 in thick steel plates are fastened "clamped" together by a 1/2 in -13 UNC bolt as shown in the previous figure (i.e. problem 2). When the plates are initially assembled (i.e. before an external load is applied), the bolt is tightened to a torque of 57 ft lb. The "screw coefficient of friction" and the "collar coefficient of friction" are μ = μc = 0.15. The collar diameter d. 1.5d. What maximum external load "F" can be applied to the bolted connection if the minimum allowable clamping force "F" is 2000 lb? The elastic modulus for the bolt is E₂ = 30 x106 psi and the elastic modulus for the plates is E₁ = 26 x10 psi. (Hint: Use Equation 10.14 Pg 401 (Textbook) and Figure 10.28 Pg 402 (Textbook) to determine the bolt stiffness k, and the clamped member stiffness k. Assume that the threads stop immediately above the nut.) Ans. Fe 6131 lb d₁ 30° Conical effective clamped volume d3- (Hexagonal bolt head and nut)

Two 3/8 in thick steel plates are fastened "clamped" together by a 1/2 in -13 UNC bolt as shown in the previous figure (i.e. problem 2). When the plates are initially assembled (i.e. before an external load is applied), the bolt is tightened to a torque of 57 ft lb. The "screw coefficient of friction" and the "collar coefficient of friction" are μ = μc = 0.15. The collar diameter d. 1.5d. What maximum external load "F" can be applied to the bolted connection if the minimum allowable clamping force "F" is 2000 lb? The elastic modulus for the bolt is E₂ = 30 x106 psi and the elastic modulus for the plates is E₁ = 26 x10 psi. (Hint: Use Equation 10.14 Pg 401 (Textbook) and Figure 10.28 Pg 402 (Textbook) to determine the bolt stiffness k, and the clamped member stiffness k. Assume that the threads stop immediately above the nut.) Ans. Fe 6131 lb d₁ 30° Conical effective clamped volume d3- (Hexagonal bolt head and nut)

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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Question

solve/ show solution for given answer equations kb = (Ab*Eb)/ g and kc = (Ac*Ec) / g

G is the approximate effective length

Two 3/8 in thick steel plates are fastened "clamped" together by a 1/2 in -13 UNC bolt as shown
in the previous figure (i.e. problem 2). When the plates are initially assembled (i.e. before an
external load is applied), the bolt is tightened to a torque of 57 ft lb. The "screw coefficient of
friction" and the "collar coefficient of friction" are μ = μc = 0.15. The collar diameter d. 1.5d.
What maximum external load "F" can be applied to the bolted connection if the minimum
allowable clamping force "F" is 2000 lb? The elastic modulus for the bolt is E₂ = 30 x106 psi and
the elastic modulus for the plates is E₁ = 26 x10 psi. (Hint: Use Equation 10.14 Pg 401
(Textbook) and Figure 10.28 Pg 402 (Textbook) to determine the bolt stiffness k, and the clamped
member stiffness k. Assume that the threads stop immediately above the nut.)
Ans. Fe 6131 lb

d₁
30°
Conical effective
clamped volume
d3-
(Hexagonal bolt
head and nut)

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