Homework Help: Mechanics of Materials - is this correct?

1. Dec 2, 2011

niece of md.

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

I was attempting to solve this exercise, but since I have no answers, I have no way of knowing if it's correct.

Any help Is more than appreciated

2. Dec 2, 2011

PhanthomJay

You did a superior job with this and your work is well presented.. the lowest value of P is the answer. Excellent work!

3. Jan 27, 2012

SolidElast

All the best! There is my verification
http://img821.imageshack.us/img821/8128/tophysicsforum02.png [Broken]

Last edited by a moderator: May 5, 2017
4. Jan 27, 2012

SolidElast

By the way Elongations (z - from left to right within each segment)
$w_{{1}}=4\,{\frac {Pz}{E\pi \,{{\it Diam}}^{2}}}$

$w_{{2}}=4\,{\frac {P \left( z{{\it Diam}}^{2}+a{{\it diam}}^{2} \right) }{{{\it Diam}}^{2}E\pi \,{{\it diam}}^{2}}}$