Calculate Stress & Strain from Lab Results for Steel

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To calculate stress and strain from the lab results for steel, first determine the original and final cross-sectional areas using the diameters provided. Stress can be calculated by dividing the maximum load force of 26.43 kN by the cross-sectional area. Strain is determined by the change in length (final length minus original length) divided by the original length. The elastic modulus may be needed for further analysis, especially if considering the material's behavior under load. Understanding these calculations is essential for evaluating the steel's performance under stress.
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How would i calculate the stress and strain with the results from a lab below:

Steel’s original diameter: 8.00 mm
Steel’s original length: 49.96 mm
Steel’s final diameter: 4.64 mm
Steel’s final length: 63.17 mm
Steel’s maximum load force: 26.43 kN

I also have an MS Excel table of time, laser extensometer (mm) and load (kN) of the steel.

I have no idea where to begin :S
 
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Ok don't worry i think i figured it out
 
One would need the elastic modulus.

Steel’s original diameter: 8.00 mm
Steel’s original length: 49.96 mm
Steel’s final diameter: 4.64 mm
Steel’s final length: 63.17 mm

Assuming the final dimensions are measured in the unloaded condition, the steel has undergone permanent (plastic deformation) and the max load corresponds to the ultimate tensile strength.

Stress is just load divided by cross-sectional area, which has changed.
 

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