Shear strength due to sliding impact

[MobileMRI]

I have a bolted joint consisting of the following parts (from top to bottom):
Nut
Flat washer
Plate A
Plate B
Bolt head

Plate A's thru-hole is about twice the diameter of the bolt bolt to allow for large assembly tolerances. Let's assume the clamping force is reduced to zero due to the nut vibrating loose. Let's also assume that the entire assembly is travelling down the road and comes to a sudden stop--resulting in plate A sliding with respect to Plate B. Therefore the edge of Plate A impacts the bolt. What I'm trying to figure out is how to calculate the amount of shear force applied to the bolt.

 

[CoryPad]

The force is determined by Newton's equation F = ma, where m is Plate A's mass and a is its acceleration. Based on your information, you will need to determine the initial velocity v and estimate the time t during the "sudden" stop: then a = v/t.