A bracket is riveted to a columm by 6 rivets of equal size as shown in Fig. 9.38. It carries a load of 100 kN at a distance of 250 mm from the col- umn. If the maximum shear stress in the rivet is limited to 63 MPa, [Ans. 41 mm] find the diameter of the rivet.
A bracket is riveted to a columm by 6 rivets of equal size as shown in Fig. 9.38. It carries a load of 100 kN at a distance of 250 mm from the col- umn. If the maximum shear stress in the rivet is limited to 63 MPa, [Ans. 41 mm] find the diameter of the rivet.
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 number 17
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Contents
Riveted Joints
· 339
20 kN
100 kN
80
250
30
75
30
75
30
+ 75 • 75
All dimensions in mm.
All dimensions in mm.
Fig. 9.37
Fig. 9.38
100 kN
17. A bracket is riveted to a columm by 6 rivets of equal size as shown
in Fig. 9.38.
It carries a load of 100 kN at a distance of 250 mm from the col-
umn. If the maximum shear stress in the rivet is limited to 63 MPa,
[Ans. 41 mm]
80
find the diameter of the rivet.
18. A bracket in the form of a plate is fitted to a column by means of
four rivets of the same size, as shown in Fig. 9.39. A load of 100
kN is applied to the bracket at an angle of 60° to the horizontal and
the line of action of the load passes through the centre of the bot-
80
80
61
352 / 1251
tom rivet. If the maximum shear stress for the material of the rivet
is 70 MPa, find the diameter of rivets. What will be the thickness
of the plate if the crushing stress is 100 MPa?
[Ans. 29 mm; 1.5 mm]
All dimensions in mm.
Fig. 9.39
QUESTIONS
1. What do you understand by the term riveted joint? Explain the necessity of such a joint.
2. What are the various permanent and detachable fastenings? Give a complete list with the different
types of each category.
3. Classify the rivet heads according to Indian standard specifications.
What is the material used for rivets?
4.
5. Enumerate the different types of riveted joints and rivets.
6. What is an economical joint and where does it find applications?
7. What is the difference between caulking and fullering? Explain with the help of neat sketches.
8. Show by neat sketches the various ways in which a riveted joint may fail.
9. What do you understand by the term 'efficiency of a riveted joint’? According to I.B.R., what is the
highest efficiency required of a riveted joint?
10. Explain the procedure for designing a longitudinal and circumferential joint for a boil
11. Describe the procedure for designing a lozenge joint.
12. What is an eccentric riveted joint? Explain the method adopted for designing such a joint?
OBJECTIVE TYPE QUESTIONS
1. Arivet is specified by
(a) shank diameter
(b) length of rivet
(c) type of head
(d) length of tail
Тop
Contents
340 - A Textbook of Machine Design
2. The diameter of the rivet hole is usually .. . the nominal diameter of the rivet.
(a) equal to
3. The rivet head used for boiler plate riveting is usually
(a) snap head
(c) counter sunk head
4. According to Unwin's formula, the relation between diameter of rivet hole (d) and thickness of plate
(1) is given by
(b) less than
(c) more than
(b) pan head
(d) conical head
(b) d = 1.6 i
(d) d = 61
(a) d=t
(c) d= 2t
where d and t are in mm.
5. A line joining the centres of rivets and parallel to the edge of the plate is known as
(a) back pitch
(c) gauge line
6. The centre to centre distance between two consecutive rivets in a row, is called
(a) margin
(c) back pitch
7. The objective of caulking in a riveted joint is to make the joint
(b) marginal pitch
(d) pitch line
(b) pitch
(d) diagonal pitch
(a) free from corrosion
(c) free from stresses
(b) stronger in tension
(d) leak-proof
8. A lap joint is always in ..shear.
(a) single
9. A double strap butt joint (with equal straps) is
(a) always in single shear
(c) either in single shear or double shear
(b) double
(b) always in double shear
(d) any one of these
10. Which of the following riveted butt joints with double straps should have the highest efficiency as
per Indian Boiler Regulations?
(a) Single riveted
(c) Triple riveted
11. If the tearing efficiency of a riveted joint is 50%, then ratio of diameter of rivet hole to the pitch of
(b) Double riveted
(d) Quadruple riveted
...
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Transcribed Image Text:10:34 AM " O
50
Select text
O:
Contents
Riveted Joints
· 339
20 kN
100 kN
80
250
30
75
30
75
30
+ 75 • 75
All dimensions in mm.
All dimensions in mm.
Fig. 9.37
Fig. 9.38
100 kN
17. A bracket is riveted to a columm by 6 rivets of equal size as shown
in Fig. 9.38.
It carries a load of 100 kN at a distance of 250 mm from the col-
umn. If the maximum shear stress in the rivet is limited to 63 MPa,
[Ans. 41 mm]
80
find the diameter of the rivet.
18. A bracket in the form of a plate is fitted to a column by means of
four rivets of the same size, as shown in Fig. 9.39. A load of 100
kN is applied to the bracket at an angle of 60° to the horizontal and
the line of action of the load passes through the centre of the bot-
80
80
61
352 / 1251
tom rivet. If the maximum shear stress for the material of the rivet
is 70 MPa, find the diameter of rivets. What will be the thickness
of the plate if the crushing stress is 100 MPa?
[Ans. 29 mm; 1.5 mm]
All dimensions in mm.
Fig. 9.39
QUESTIONS
1. What do you understand by the term riveted joint? Explain the necessity of such a joint.
2. What are the various permanent and detachable fastenings? Give a complete list with the different
types of each category.
3. Classify the rivet heads according to Indian standard specifications.
What is the material used for rivets?
4.
5. Enumerate the different types of riveted joints and rivets.
6. What is an economical joint and where does it find applications?
7. What is the difference between caulking and fullering? Explain with the help of neat sketches.
8. Show by neat sketches the various ways in which a riveted joint may fail.
9. What do you understand by the term 'efficiency of a riveted joint’? According to I.B.R., what is the
highest efficiency required of a riveted joint?
10. Explain the procedure for designing a longitudinal and circumferential joint for a boil
11. Describe the procedure for designing a lozenge joint.
12. What is an eccentric riveted joint? Explain the method adopted for designing such a joint?
OBJECTIVE TYPE QUESTIONS
1. Arivet is specified by
(a) shank diameter
(b) length of rivet
(c) type of head
(d) length of tail
Тop
Contents
340 - A Textbook of Machine Design
2. The diameter of the rivet hole is usually .. . the nominal diameter of the rivet.
(a) equal to
3. The rivet head used for boiler plate riveting is usually
(a) snap head
(c) counter sunk head
4. According to Unwin's formula, the relation between diameter of rivet hole (d) and thickness of plate
(1) is given by
(b) less than
(c) more than
(b) pan head
(d) conical head
(b) d = 1.6 i
(d) d = 61
(a) d=t
(c) d= 2t
where d and t are in mm.
5. A line joining the centres of rivets and parallel to the edge of the plate is known as
(a) back pitch
(c) gauge line
6. The centre to centre distance between two consecutive rivets in a row, is called
(a) margin
(c) back pitch
7. The objective of caulking in a riveted joint is to make the joint
(b) marginal pitch
(d) pitch line
(b) pitch
(d) diagonal pitch
(a) free from corrosion
(c) free from stresses
(b) stronger in tension
(d) leak-proof
8. A lap joint is always in ..shear.
(a) single
9. A double strap butt joint (with equal straps) is
(a) always in single shear
(c) either in single shear or double shear
(b) double
(b) always in double shear
(d) any one of these
10. Which of the following riveted butt joints with double straps should have the highest efficiency as
per Indian Boiler Regulations?
(a) Single riveted
(c) Triple riveted
11. If the tearing efficiency of a riveted joint is 50%, then ratio of diameter of rivet hole to the pitch of
(b) Double riveted
(d) Quadruple riveted
...
--
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