- #1

Colt 45 J

- 6

- 0

**1. Problem Statement**

The long bolt passes through the 30-mm-thick plate. If the force in the bolt shank is 8kN, determine the average normal stress in the shank, the average shear stress along the cylindrical area of the plate defined by the section lines a-a, and the average shear stress in the bolt head along the cylindrical area defined by the section lines b-b.

http://img340.imageshack.us/img340/698/solidsproblem1102.jpg

**Note:**I have solved the shear on the bolt head, as well as the average normal stress in the shank, it's the average shear along the plate that I am having issues with.

## Homework Equations

τ = V / A

o= N / A

## The Attempt at a Solution

Distribution of forces so the equivalent is 4kN

τ = 4000/(pi*(.009^2-.0035^2))

τ = 18.52MPa

The answer key (which has yet to be wrong in my experience for this textbook) says that the average shear should be 4.72MPa

**Edit:**

Figured out my error

τ= 8000/(pi*(.018*.03))

τ=4.716MPa

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