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Concept explainers
Consider the sleeve made From two copper tubes joined by tin-lead solder over distance s. The sleeve has brass caps at both ends that are held in place by a steel bolt and washer with the nut turned just snug at the outset. Then, two "loadings" are applied: a = 1/2 turn applied to the nut; at the same time, the internal temperature is raised by ?T = 30°C.
(a) Find the forces in the sleeve and boll, Psand PB, due to both the priestess in the bolt and the temperature increase. For copper, use EI= 120 GPa and ac= 17 × W+C; for steel, use E, = 200 GPa and a, = 12 × 10-6/°C. The pitch of the boll threads is p = 1.0 mm. Assume s = 26 mm and bolt diameter dB= 5 mm.
(b) Find the required length of the solder joint, s, if shear stress in the sweated joint cannot exceed the allowable shear stress t ™ 18.5 MPa.
(c) What is the final elongation of the entire assemblage due to both temperature change A T and the initial prestress in the bolt?
(a)
![Check Mark](/static/check-mark.png)
The force on the sleeve and force on the blot.
Answer to Problem 2.5.28P
The force on the sleeve is =
The force on the bolt is =
Explanation of Solution
Given information:
The length of the copper sleeve is
Write the expression for area of bolt.
Here, area of the bolt is
Write the expression for the area of the copper sleeve.
Here, area of the copper sleeve is
Write the expression for the area of steel bolt.
Here, area of steel bolt is
Write the expression for the elongation in bolt.
Here, elongation in bolt is
Write the expression for elongation.
Here, elongation is
Write the compatibility Equation for elongation.
Calculation:
Substitute
Substitute
Substitute
Substitute
Substitute
Substitute
Since
Conclusion:
The force on the sleeve is
The force on the bolt is
(b)
![Check Mark](/static/check-mark.png)
The required length of the joint.
Answer to Problem 2.5.28P
The required length of the joint is
Explanation of Solution
Given information:
The length of the copper sleeve is
Write the expression for area.
Here, area of sleeve is
Write the expression for allowable shear stress.
Here, allowable shear stress is
Calculation:
Substitute
Substitute
Conclusion:
The required length of joint is
(c)
![Check Mark](/static/check-mark.png)
The final displacement.
Answer to Problem 2.5.28P
The final displacement is
Explanation of Solution
Given information:
The length of the copper sleeve is
Write the expression for displacement in bolt.
Here, the displacement in bolt is
Write the expression for displacement in sleeve.
Here, the displacement in sleeve is
Write the expression for final elongation.
Here, the final elongation is
Calculation:
Substitute
Substitute
Substitute
Conclusion:
The final displacement is =
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Chapter 2 Solutions
Mechanics of Materials, SI Edition
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- Mechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage Learning
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