Single or Double Shear? Explaining the shear load distribution in a-a and b-b.

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SUMMARY

The discussion clarifies the shear load distribution in two configurations labeled "a-a" and "b-b." The first configuration is identified as double shear, where the shear load from the bar is resisted by two shear planes in the bolt, supported by the clevis attachment vang plate. In contrast, the second configuration is classified as single shear, as it involves equal and opposite forces applied to the pin without end supports, resulting in a single shear plane between the two loads.

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yes the first one is in double shear, but the second is single shear. In the first, the shear load from the bar is resisted by 2 shear planes in the bolt, one plane on each side of the bar. The bolt is supported at its end by the clevis attachment vang plate. Classic double shear.

In the second, you are applying equal and oppposite forces to the pin, with no end supports ...single shear(the shear plane is in between the 2 loads).
 

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