You can estimate the load with a little information.
Lets just assume that the trunion (or shear pin if you want to calculate that) is hollow. So if you were to look at a cross section of the trunion, it would be 2 concentric circles. To find out how much shear strength the trunion would have at that one cross section, calculate the area between the two circles.
pi(r2^2 - r1^2) where R2
is the greater radius
Then take the shear strength of the material and multiply it by the area. Lets assume that the steel has a shear strength of 100 ksi and the area is 10 sq in. Then the shear strength is 1000 k lbs or 1000000 lbs. Just an example on how to calculate single shear loading. Impact loading is different, some else want to tackle that one?
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