Explain the difference single shear and double shear?

Answer 1

Single shear carries all load on one face whule double shear carries it on two faces, so stress is lowere by a factor of 2 for a given load.

For example shear stress on a cantilever pin is V/A ( load/area, single shear) but on a pin between two supports it is V/2A

Answer 2

Unlike joints with fasteners in double shear, those containing fasteners in single shear are nonsymmetrical, which results in local bending of the fastened plates. Thus, even for assemblies loaded in tension, it might be desirable to provide lateral support in the joint region. Therefore, ASTM D 5961 was revised in 2001 to incorporate the laminate bearing lateral support fixture (see Fig. 1). The revised standard still considered only tensile testing of a single- or double-fastener joint and included the option to conduct tests with or without the lateral support fixture. When the fixture was not used, the intent was to simulate an unstabilized joint. When used, it was with the understanding that full stabilization would not be achieved, but rather a condition intermediate between unstabilized single-shear and symmetrical (and thus stable) double-shear loading would be realized.

Answer 3

A single shear has just one pair or scissors while a double shear has two sets.