Question

If 'p' and 'd' are pitch and gross diameter of rivets, the efficiency of the rivets joint is:-
1. p/(p - d)
2. p/(p + d)
3. (p - d)/p
4. (p + d)/p

Answer 1

Correct Answer - Option 3 : (p - d)/p

Explanation:

Efficiency of Riveted Joints: It is the ratio of the strength of the riveted joint to the strength of the connected plates.

If P = Pitch, d = Gross diameter of rivet

If 't' is the thickness of the plate.

Then,

\({\bf{Efficiency}}{\rm{ }}{\bf\ {of}}{\rm{ }}{\bf\ {joint}}\left( {\bf{\eta }} \right) = \frac{{{\bf{Strength}}{\rm{ }}{\bf\ {of}}{\rm{ }}{\bf\ {joint}}}}{{{\bf{Strength}}{\rm{ }}{\bf\ {of}}{\rm{ }}{\bf\ {plate}}}}\)

\({\bf{Efficiency}}{\rm{ }}{\bf{of}}{\rm{ }}{\bf\ {joint}}\left( {\bf{\eta }} \right) = \frac{{\left( {{\bf{p}} - {\bf{d}}} \right){\bf{t}} \times {\bf{Permissible}}{\rm{ }}{\bf\ {stress}}}}{{{\bf{pt}} \times {\bf{Permissible}}{\rm{ }}{\bf\ {stress}}}}\)

\({\bf{Efficiency}}{\rm{ }}{\bf\ {of}}{\rm{ }}{\bf\ {joint}}\left( {\bf{\eta }} \right) = \frac{{\left( {{\bf{p}} - {\bf{d}}} \right)}}{{\bf{p}}}\)