# Two dimensional stress problem

1. Sep 25, 2011

### temaire

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

3. The attempt at a solution

My stress element is as follows:

Using trig I solved for $\sigma_x^' = 34.641 MPa$.

Then I used the following equation to solve for $\sigma_x$:

I get $\sigma_x = 34.07 MPa$. However, the answer is supposed to be $\sigma_x = 38.68 Mpa$. Where am I going wrong?