3.4.2.2 - The Young Modulus Flashcards
Up to what point are stress and strain proportional to each other?
The limit of proportionality.
If stress and strain are proportional what does that mean?
There is a constant - the Young modulus
Young modulus =
Tensile stress / tensile strain
What is the Young modulus?
A measure of the stiffness of a material.
What do engineers use the Young modulus for?
To make sure the materials they are using can withstand sufficient forces.
What experiment can you use to find the Young modulus of an object?
Using a long thin wire of known cross sectional area measure its extension as you add known masses. Use the values calculated to work out the stress and strain, then plot a graph of stress-strain. The gradient is Young modulus.
What is the are underneath a stress-strain graph?
Gives the strain energy per unit volume.