Youngs Modulus
By DarthVader
Date: 2022-05-05
Topic: 108 see comments
Post views: 1071
Youngs Modulus
Youngs Modulus is a ratio between the stress and strain of a material.
It is found from a stress, strain graph.
Equation:
E = σ / ε
E = Youngs Modulus ( N m-2 ) (Pa)
σ = Stress (N m-2)
ε = Strain (no units)
In practise, when determining the ratio E from experimental data, an accurate value will be obtained by looking at the linear portion of the stress-strain graph and calculating the ratio:
E = change in stress / change in strain
This is determined by the slope of the linear portion of the graph (slope formula)
Limit of proportionality - The end of the linear period in the graph.
Elastic limit - The point beyond which any further stress results in plastic deformation.
Yield stress - The stress measured at the elastic limit. (σy)
Ultimate tensile strength (UTS) - The point where the stress reaches its maximum value.
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