Why single shear strength is greater than unit double shear?
Answers
Consider these two plates that are bolted together.
The force F is trying to separate them as shown.
The bolt connecting the two is subjected to a shear force across the plane that separates the two plates.
There is shear only at this plane of the bolt and the entire force F is resisted only by this single shear plane in the bolt.
Three plates are stitched together by the bolt.
The middle plate is being separated by a force F.
The total force F is now applied as a shear at two planes (each F/2).
The same bolt now needs to shear off at two planes for the separation to occur.
The bolt now needs to have just half the cross sectional area to resist the same force F.
This is an example of Double shear.
Answer:
why single shear strength is greater than unit double shear?