Young's Modulus (or Modulus of Elasticity) is one of the basic concepts when it comes to understanding the behavior of any material. And hence, before one goes about the definition, it is very important to understand the term itself.
Modulus is a Latin word which means "Unit of measure." And we call is Young's modulus after the name of a British physicist, Thomas Young. So in short it is the unit of measure of elasticity given by Thomas Young.
Modulus is a Latin word which means "Unit of measure." And we call is Young's modulus after the name of a British physicist, Thomas Young. So in short it is the unit of measure of elasticity given by Thomas Young.
By definition, it is the ratio of stress produced (due to an externally applied force) in a material along the axis/direction of the applied force and the strain (deformation) produced in the material in the same axis due to that.
Young’s modulus is useful only till the yield point of the material (where the material returns to its original
dimensions when the external force is removed). As the stress increases beyond the yield point,
Young’s modulus may no longer remain constant but decrease, and the
material may undergo a permanent deformation or finally
break.
Having understood the definition, one also needs to understand that the Young's Modulus value for a material can change depending on the grain direction of the material. If the grain structure of the material is uniform (i.e. materials with no additives), the value of the Young's Modulus will be the same for a force applied from any direction. But if the grain direction is in one direction, the value would be more in the direction of the grains than any other direction.
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