1. The problem statement, all variables and given/known data I was creating a stress-strain curve for a soft aluminum alloy (as stated in problem) and was looking to find the ultimate stress and ensure my units were all okay. I have attached a screenshot of my graph. And a separate screenshot with the formulas. 2. Relevant equations E=σ/ε σ=P/A ε=δ/L0 3. The attempt at a solution I think I have my graphs correct. I am aware of how to get the modulus of elasticity, yield strength, but the ultimate strength is confusing me on this one. It couldn't be the strength at fracture. How can I find it? Also, if anyone could confirm that my units are set up correctly, I would greatly appreciate it.