riveted joints hareesha n g dept. of aeronautical engg dayananda sagar college of engineering...

Riveted Joints

Hareesha N GDept. of Aeronautical Engg

Dayananda Sagar College of EngineeringBangalore-78

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Introduction• A rivet is a short cylindrical bar with a head integral to it. The

cylindrical portion of the rivet is called shank or body• and lower portion of shank is known as tail.• The rivets are used to make permanent fastening between the

plates such as in structural work, ship building, bridges, tanks and boiler shells.

• The riveted joints are widely used for joining light metals.

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Types of Rivet Heads

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Types of riveted joints1. Lap joint2. Butt joint• Lap joint: A lap joint is that in which one plate overlaps the

other and the two plates are then riveted together.• Butt joint: A butt joint is that in which the main plates are kept

in alignment butting (i.e. touching) each other and a cover plate (i.e. strap) is placed either on one side or on both sides of the main plates. The cover plate is then riveted together with the main plates.

Butt joint

Lap joint 404/18/23 Hareesha N Gowda, DSCE, Blore-78

Important Terms Used in Riveted Joints• The following terms in connection with the riveted joints are

important from the subject point of view :1. Pitch. It is the distance from the centre of one rivet to the centre of

the next rivet measured parallel to the seam as shown in Fig. It is usually denoted by p.

2. Transverse pitch. It is the perpendicular distance between the centre lines of the successive rows as shown in Fig. It is usually denoted by pt.

3. Diagonal pitch. It is the distance between the centres of the rivets in adjacent rows of zig-zag riveted joint as shown in Fig. It is usually denoted by pd.

4. Margin or marginal pitch. It is the distance between the centre of rivet hole to the nearest edge of the plate as shown in Fig. It is usually denoted by m.

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Proportions of dimensions of riveted joints• Thickness of plate

t = Thickness of the plate• Diameter of rivets.the diameter of the rivet hole (d) may be determined by using

• Distance of centre of the rivet from edge of the plate = 1.5d

• Margin , m=d• Longitudinal Pitch p=3d• Transverse pitch pt = 0.8P for chain riveting

= 0.6P for zig-zag riveting• Thickness of butt strap. Single cover plate t1 = 1.125 t Double cover plate t2 = 0.7 to 0.8t04/18/23 6Hareesha N Gowda, DSCE, Blore-78

• Types of Riveted joints

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• Double Riveted lap joints

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• Double Riveted Zig zag Lap joint

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• Single riveted, single strap butt joint

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• Single riveted, double strap butt joint

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• Double riveted, double strap chain butt joint

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• Double riveted, double strap zig zag butt joint

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