Solving Stress-Strain Curve: Ultimate Stress, Units Confirmation

AI Thread Summary
The discussion focuses on creating a stress-strain curve for a soft aluminum alloy, specifically determining the ultimate stress and verifying unit correctness. The user expresses confusion regarding the definition of ultimate strength, questioning if it is the same as the strength at fracture. Clarifications indicate that ultimate strength refers to the maximum stress a material can withstand before failing. Additionally, feedback confirms that the user's units are appropriately set up for the calculations involved. Understanding the distinction between ultimate strength and fracture strength is crucial for accurate analysis.
aaronfue
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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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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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