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Stress-Strain Diagram

  • Thread starter aaronfue
  • Start date
  • #1
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Homework Statement



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.

Homework Equations



E=σ/ε
σ=P/A
ε=δ/L0

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.
 

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Answers and Replies

  • #2
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
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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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