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Homework Help: Stress-Strain Diagram

  1. Jun 9, 2013 #1
    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


    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.

    Attached Files:

  2. jcsd
  3. Jun 9, 2013 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Ultimate strength means the stress at fracture. Once the sample fractures, it cannot support any more stress.

    Your units look OK.
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