1. The problem statement, all variables and given/known data E = 290 GNm-2 Yield Stress = 500 MPa Q. What pressure would a strain of 40 με indicate? 2. Relevant equations Hoop Strain. εθ = 1/E (σθ − νσz) = 1/E (pr/t − ν(pr/2t). 3. The attempt at a solution I am looking for some direction on how to determine the poisson ratio with just the above information? Given that the above equation has 2 unknown values. If i assign a poisson ratio of 0.3 which would logically not be a bad decision- as most vessels are steel! Then i can easily solve the above for p But i prefer to understand a way of solving for V can anyone help ?