cotter joint
TRANSCRIPT
SPIGOT AND SOCKET JOINT(COTTER JOINT)
• Rods, having axial tensile or compressive forces are connected by cotter joints. Rods may be of different cross sections like circular or square.
• This is a temporary method of joining the rods.
• Cotter joints can be quickly assembled as well as disassembled.
SECTIONAL VIEW
SOCKET SPIGOT
COTTER
COLLAR
ROD
Cotter joint
FIG 01: ASSEMBLED COTTERED JOINT
Cotter joint – modes of failure
FIG 02: STEEL SPIGOT BREAKING IN TENSION OUTSIDE THE JOINT
F
F
TENSIO
N
FAILU
RE
FIG 02: STEEL SPIGOT BREAKING IN TENSION OUTSIDE THE JOINT
WROUGHT IRON ROD BREAKING IN TENSION OUTSIDE THE JOINT
FIG 05: SPIGOT BREAKING IN TENSION ACROSS SLOT
Cotter joint – modes of failure
TENSIO
N
FAILU
RE
FIG 07: SOCKET BREAKING IN TENSION ACROSS SLOT
TENSIO
N
FAILU
RE
Cotter joint – modes of failure
FIG 06: DOUBLE SHEARING OF COTTER PIN
FIG 09: DOUBLE SHEARING OF SOCKET END
SHEAR
FAILU
RE
Cotter joint – modes of failure
Cotter joint – modes of failure
FIG 11: SHEARING AWAY OF THE COLLAR IN THE SPIGOT
FIG 12: SHEARING AWAY OF SOCKET (IF dw < dl)
FIG 10: SHEARING OF SPIGOT END
SHEAR
FAILU
RE
FIG 08: CRUSHING OF COTTER PIN AGAINST SOCKET
BEARING
FAILU
RE
FIG 04: CRUSHING OF COTTER PIN AGAINST ROD END
Cotter joint – modes of failure
CRUSHING FAILURE OF SPIGOT COLLAR
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