design of riveted joints(basics)

RIVETED JOINTS

Rivet Materials

             Rivets are made of Wrought iron on soft steel for most uses, but where corrosive resistance or light weight is requirement, rivets of copper or aluminium is used.

             Kinds of riveted joints: Joints may be single, double triple.  If the rivets in the rows are in line crosswise the joint is said to be chain riveted.  While if the rivets in adjacent rows offset by one half the centre to centre distance, then it is said to be zig-zag riveted.

             Failure of Riveted joints: These joints may fail in no. of ways, they are single shear, double shear, failure by tearing of plate. Failure of margin, crushing of rivet or hole. Failure by tearing due to bending of plate.

Design of a Riveted joint

1.          Plates may tear in the line of mini section. 

             The line of mini section is the line through the centre of hole.

             Area of plate along this line = (p – d) t

             Plate renaissance to lesion = (p – d) t ft

3.          Plate and rivets may crush or fail in compression.

             Resistance to crushing = dt fc z.

4.          The rivets may shear

             Resistance to single shear = p/4  d² fs z.

             Resistance to double shear = p/4 d² fs kz.

Efficiency of joint:

References

1.      Mechanical Engineering Design – Joseph Shigley

2.      Machine Design – Mubeen

3.      Machine Design – Black

4.      Principles of Lubrication – Cameron A.