What are the possible ways of failure of a cotter joint?

Failure of cotter in shear. Failure of the socket collar in crushing. Failure of socket end in shearing. Failure of rod end in shear.

Which of the following could be the reason for the failure of a cotter joint?

Cotter Joint MCQ Question 1 Detailed Solution It is not used to connect the shafts that are rotating or transmitting torque. e.g. Joint between the piston rod and the crosshead of a steam engine. The cotter in the cotter joints fails due to double shear.

Which type of failure of cotter is subjected to in a spigot and cotter joint?

double shear
Explanation: Cotter is subjected to double shear hence width=P/(2*τ*t). Explanation: Compressive stress= P/ [(socket dia-spigot dia)*thickness]. 9. Cotter joint can be used to connect two rods for torque transmission purpose.

What is socket and spigot cotter joint?

A cotter joint, also known as a socket and spigot joint, is a method of temporarily joining two coaxial rods. One rod is fitted with a spigot, which fits inside a socket on one end of the other rod. Slots in the socket and the spigot align so that a cotter can be inserted to lock the two rods together.

What will be the shearing area of the cotter if it fails in shear?

Failure of cotter in shear Since the cotter is in double shear, therefore shearing area of the cotter = 2 b × t and shearing strength of the cotter =2 b × t × τ Equating this to load (P), we have P =2 b × t × τ From this equation, width of cotter (b) is determined.

What are the different modes of failure of knuckle joint?

The modes of failure are: Shear failure of Knuckle pin(single shear). Crushing of pin against the rod. Tensile failure of flat end bar. Tensile failure of solid rod.

Which of the following could be the reason for the failure of a knuckle joint?

Failure of Knuckle Joints: Tensile failure of flat end bars. Tensile failure of a solid rod. Finger pin single eye or tensile failure in rod and hole. Failure beyond single eye end shear pinhole (double shear).

What are the applications of socket and spigot joints?

#3. It is not suitable for connecting a rotating shaft that transmits torque. The axes of joining rods must be matched. The above three parts, spigot, sockets, and cotters, together form a cotter joint. One of the two connecting rods consists of a spigot and a socket.

What are the elements required for socket and spigot cotter joint?

Cotter Joint has mainly three components – spigot, socket and cotter as shown in Figure 9.1. Spigot is formed on one of the rods and socket is formed on the other. The socket and the spigot are provided with a narrow rectangular slot. The cotter is tightly fitted in this slot.

Which of the following are important parts of knuckle joint?

Explanation: In rare explanation, two rods with forks and one rod with eye is connected. 4. A knuckle joint is also called socket pin joint.

What is the material of socket and spigot joint?

Ductile iron pipe(spigot and socket joint) is a pipe made of ductile cast iron commonly used for potable water transmission and distribution. This type of pipe is a direct development of earlier cast iron pipe.

Which of the following is shear failure equation of knuckle pin?

Solution: Explanation: As the pin is subjected to double shear diameter (D) = √(2P/π x τ) = 38.80mm. If knuckle joint is to fail by crushing failure of pin in fork, then determine the diameter of knuckle pin when 50kN axial tensile force act on rods.

What happens when the Cotter is tight in the socket?

When the cotter is tight in the socket and spigot, failure occurs due to shear, but when it is loose, it is subjected to bending moment as shown in figure. It is assumed that: the force between cotter and spigot end is uniformly distributed and uniformly varying between the socket end and cotter.

What is a socket and spigot Cotter joint?

In a socket and spigot cotter joint, one end of the rods (say A) is provided with a socket type of end as shown in Fig. 1 and the other end of the other rod (say B) is inserted into a socket. The end of the rod which goes into a socket is also called spigot. A rectangular hole is made in the socket and spigot.

What is the effect of double shear on Cotter?

The cotter is subjected to double shear. When the cotter is tight in the socket and spigot, failure occurs due to shear, but when it is loose, it is subjected to bending moment as shown in figure. It is assumed that: the force between cotter and spigot end is uniformly distributed and uniformly varying between the socket end and cotter.

What is the use of a cotter joint?

Cotter joint is widely used to connect the piston rod and crosshead of a steam engine, as a joint between the piston rod and the tailor pump rod, foundation bolt etc. Cotter Joint has mainly three components – spigot, socket and cotter as shown in Figure 9.1. Spigot is formed on one of the rods and socket is formed on the other.