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Riveted Joints. Cannot be dismantled without some part of the joint being destroyed. Riveted joints were used in boilers, bridges, cranes etc
Riveted Joints Permanent fastenings Cannot be dismantled without some part of the joint being destroyed Riveted joints were used in boilers,...
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Dominic Hall
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Riveted Joints
Permanent fastenings
Cannot be dismantled without some part of the joint being destroyed
Riveted joints were used in boilers, bridges, cranes etc.
Replaced widely by welding recently
Still in use in the production of structures made of light alloys
Welding is not so reliable there
Production Process:
Rivets are machine forged with single head, keeping proper size for the tail
Holes are punched or drilled on the parts to be joined
Rivets are made red-hot, inserted through the holes, keeping the rivet head firmly in place
The head on the other side is formed by pneumatic or hydraulic pressure
Contraction of the rivet, as it cools, draws the plates together closely
Rivets and Rivet Heads
Rivet material must be strong and highly ductile
Rivets must resist mainly shearing action
Commonly adopted material for rivets is mild steel
Copper brass or aluminium rivets can also be used if strength is not a leading factor
Rivet heads with various proportions are in use depending on applications
Snap heads are used for structural work, pressure vessels and for machine riveting
Countersunk heads are used in ship building
For hand hammering, conical rivet heads are used
Types of Riveted Joints
Lap Joint
Single riveted
Double riveted
Triple riveted
Butt Joint
Single Butt Strap Joints
Double butt strap joints
Single, double triple and quadruple riveted Single, double triple and quadruple riveted
Chain or Zigzag riveted joints
Types of Riveted Joints (Contd…)
Caulking and Fullering
Edges of the plates for boilers tanks etc. are usually bevelled to an angle of 80º to facilitate fullering and caulking operations
Edges are driven by a blunt tool to close the joints
Heads of the rivets are also turned down with a caulking tool to make the joint steam tight
Caulking requires skill; otherwise the joint may be damaged
Fullering is a better method
Failure of riveted joints
Riveted and bolted joints loaded in shear are analysed in the same way
Since the lines of action of the forces are different, rivets and the members bend
The other modes of failure are: a)
Shear of rivet
b)
Tensile failure of members
c)
Bearing of rivet on members (or, bearing of members on rivet) – failure by crushing
d) & e) Shear tearout at the margin ( >> )
Failure by bending of the rivets or of the riveted members
Bending moment, M ≈ Ft/2
F is the shearing force t is the total thickness of the connected parts
Bending stress in the members (or, in the rivet) is assumed to be
σ = Mc/I ,
where, I/c is the section modulus for the weakest element (member or rivet)
In design, this effect is taken care of, by a suitable increase in the factor of safety (
Suggest Documents
Fatigue in Riveted Joints
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THE STRUCTURE OF THE STRENGTH OF RIVETED JOINTS DETERMINED IN THE LAP JOINT TENSILE SHEAR TEST
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Read more
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Read more
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Read more
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