Calculate Stress & Strain from Lab Results for Steel

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SUMMARY

The discussion focuses on calculating stress and strain for steel using lab results. The original diameter of the steel is 8.00 mm, and the final diameter is 4.64 mm, with an original length of 49.96 mm and a final length of 63.17 mm. The maximum load force applied to the steel is 26.43 kN. To calculate stress, one must divide the load by the cross-sectional area, which varies due to the change in diameter. The elastic modulus is also essential for understanding the material's behavior under load.

PREREQUISITES
  • Understanding of stress and strain concepts
  • Knowledge of elastic modulus and its significance
  • Familiarity with cross-sectional area calculations
  • Basic proficiency in MS Excel for data analysis
NEXT STEPS
  • Calculate the cross-sectional area of the steel using the original and final diameters
  • Learn how to compute stress using the formula: Stress = Load / Area
  • Explore the concept of ultimate tensile strength in materials science
  • Investigate the use of laser extensometers for precise measurements
USEFUL FOR

Engineers, materials scientists, and students studying mechanical properties of materials will benefit from this discussion, particularly those involved in testing and analyzing the performance of steel under load.

eluu
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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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