Table of Contents
What is a Rivet?
A rivet has a cylindrical shank with a head at one end. It is used to make permanent joints between two plates. Rivet is inserted into the holes of plates (which are to be joined) and then its protruding part is upset by a hammer. Joints made with rivets are known as riveted joints.
Types of failures in Riveted Joints
- Shear failure
- Tensile failure of plates
- Crushing failure of plates
- Shear failure of plates in margin area
- Tearing of plate in margin area
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Joints made by rivets are called permanent because the parts can be only be dismantled by damaging rivets. It is Unlike the joints made by nut and bolts.
Types of Rivet heads
- Snap head or Button head
- Pan head
- Countersunk head
- Flat head
- Half countersunk head rivet
- Oval counter sunk head
- Conical head
Types of rivet Joints
Riveted joints can be classified based of following two ways
On the basis purpose riveted joints can be classified on following three types
-
Tight joints
Tight joint provides leakproof joint
-
Strong joints
Strong joints provide high strength
-
Strong tight joints
These are joints which are tight as well as leakproof
On the basis of position of plates connected
-
Butt Joint
In butt joints edges of plates are simply laid over each other and riveted
-
Lap joint
In lap joints plates lie in the same plane and joined through cover plates
Methods of making holes for riveted joints
Holes can be made in the plates either by punching or by drilling. However, there are some differences between them
| Basis of comparison | Punching | Drilling |
| Cost of hole | Cheaper | Costly |
| Accuracy of hole | Less | More |
| Plate injury in the vicinity of hole | Yes | No |
| Plate thickness | up to 25 mm | no limit |
Methods of riveting
Methods classification type 1:
- Hand riveting
- Machine riveting
Hand riveting is done by a man with the help of a hammer while Machine riveting is done with the help of a machine.
Methods classification type 2:
- Hot riveting
- Cold riveting
Differences in hot and cold riveting
| Basis of comparison | Hot riveting | Cold riveting |
| Temperature | above 1000 degree Celsius | not applicable |
| Friction to plate sliding | yes | no |
| Type of stress on shank | tensile | shear |
| Diameter of rivet | above 10 mm | below 10 mm |
Applications of riveted joints
- It is used where we have to avoid after thermal effects, as in case of welding
- Used for metals which have poor weldability
- Used for heterogeneous materials like asbestos friction lining and steel
- As welded joints have poor vibration damping capabilities so where required rivets are used in place of it
- Used for aircraft structure where Aluminium is used
Advantages of Riveted Joints
Here are the advantages of Riveted joints when compared to welded joints
- It is more reliable
- It can also be used for non ferrous metals
- Parts assembled by Riveted joint do not have any thermal after effects
- Its quality inspection is easy and cheap
- When parts are dismantled riveted parts have less damage compared to welded parts
Disadvantages of Riveted joints
Here are the disadvantages of Riveted joints when compared to welded joints
- Due to holes plates become weak
- Labor cost is more
- Overall cost of riveted joints is more
- They have more weight than welded joints
- Riveting process creates more noise
- Stress concentration near holes
Types of failures in Riveted Joints
- Shear failure
- Tensile failure of plates
- Crushing failure of plates
- Shear failure of plates in margin area
- Tearing of plate in margin area
Also read:
Image source:
Attribution: By No machine-readable author provided. Miaow Miaow assumed (based on copyright claims). – No machine-readable source provided. Own work assumed (based on copyright claims)., Public Domain, https://commons.wikimedia.org/w/index.php?curid=246104