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Young's modulus

Also known as the Tensile modulus or elastic modulus, it is a measure of the stiffness of an elastic isotropic material and is a quantity used to characterise materials. It is defined as the ratio of the stress along an axis over the strain along that axis in the range of stress in which Hooke's law holds.

It enables the calculation of the change in the dimension of a bar made of an isotropic elastic material under tensile or compressive loads and is used to predict the deflection that will occur in a statically determinate beam when a load is applied at a point in between the beam's supports. Some calculations also require the use of other material properties, such as the shear modulus, density, or Poisson's ratio.