# Replacing a hollow shaft with a solid shaft

## Homework Statement

" determine the diameter of a replacement solid shaft manufactured from the same material and subjected to the same maximum shear stress and torque"

Ok so I previously calculated the following:

Maximum shear stress= 35.8 x 106
Torque= 450.117 x 103
Hollow shaft external and internal diameters= 400mm and 200mm

## Homework Equations

T/J = shear stress/r

J= Pi x d4/32

r= D/2

## The Attempt at a Solution

Basically I attemted it in a very long winded way which was found to be wrong when I went through it with my tutor. What happened was I went off an example we done in class which was similar but for replacing a solid shaft with a hollow one whereas I am wanting to replace a hollow shaft with a solid one. I've read the rules on here and I know its not a place to get your assignments done for you but I was hoping someone would be able to give me an explanation and point me in the right direction as my tutor isn't being to helpful. Cheers.

nvn