# Calculating Youngs Modulus

• 11-13-2020, 10:09 AM
christian Bendis
Calculating Youngs Modulus
Hello all

I wondering anyone could help me with the following:-

When plotting a stress strain curve for a material I believe it is normal practice to express Strain in %.

My question would be that when calculating Youngs modulus is it typical to use Strain in units of %?

I if was to plot my stress strain curve then my equations would be:-

Stress = Force / Area
Strain = (Change in Length / Original Length)*100 (Strain is now in units of %)

If I wanted to calculate Youngs Modulus then my equation would be either:-

Youngs Modulus = (Force/Area) / [(Change in Length / Original Length)*100]

Or

Youngs Modulus = (Force/Area) / (Change in Length / Original Length)

Can anyone help?

Thanks
• 11-15-2020, 03:30 PM
Cragyon
Every stress-strain plot I've seen was reported in actual units. I don't think the strain is being report as a % but being converted into a multiple for ease of reading the plot.

A note would accompany the plot indicating strain units x 100
• 11-16-2020, 11:05 AM
Kelly Bramble
Engineers Edge does have a Stress-Strain curve Approximation calculator based on the Ramburg-Osgood equations.

Enter known data and the curve data points are calculated plotted and tabulated.

See: [URL]https://www.engineersedge.com/calculators/stressstrain_curve_15438.htm[/URL]

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