Young’s modulus, numerical constant, named for the 18th-century English physician and physicist Thomas Young, that describes the elastic properties of a solid undergoing tension or compression in only one direction, as in the case of a metal rod that after being stretched or compressed lengthwise returns to its original length. It’s pretty important for materials scientists, too, so in this article I’m going to explain what elasticity means, how to calculate Young’s modulus… Hence, the stress/strain ratio is higher for steel. This is reported as Modulus 25%, Modulus 50% etc. So, Steel material will regain its shape more easily as compared to the rubber on the application of force. In essence, the Young’s modulus of steel is more than the Young’s modulus of rubber. For the same stress, the strain of steel is lesser as compared to that of rubber. Measuring Young’s Modulus. As stated above, when performing a Tensile Strength test a stress-strain curve is plotted. Young’s Modulus (also referred to as the Elastic Modulus or Tensile Modulus), is a measure of mechanical properties of linear elastic solids like rods, wires, and such. There are other numbers that give us a measure of elastic properties of a material, like Bulk modulus and shear modulus, but the value of Young’s Modulus is most commonly used. 1,500–15,000 lbf/in² (psi) 1 500 pound/square inch = 10 342 135.92 newton/square meter. Stress, Strain & Young’s Modulus Young’s modulus (E) is defined as the ratio of the stress applied to the material along the longitudinal axis of the specimen tested and the deformation or strain, measured on that same axis. The slope of this curve is the Young’s Modulus and any point on that curve is a Tangent Modulus. The moduli of rubber samples are typically expressed as the stress needed to strain a rubber sample for 25%, 50%, 100%, 200% and 300%. The Young’s, E, modulus is given by F/A = E× ∆L/L, where L is the length, F is the applied force ( mg for the weight in this case), and A is the cross sectional area of the material (rubber). The higher these percentages are, the stiffer the material is. For example, as compared to rubber, the value of young’s modulus is more for steel material (Refer to Table 2). The more the value of elastic modulus means the more elastic the material is. The Young's Modulus of a material is a fundamental property of every material that cannot be changed. Hence, Steel is more elastic than rubber. Note that rubber Young’s modulus is the ratio of longitudinal stress and longitudinal strain. What is the modulus of rubber? If we look into above examples of Stress and Strain then the Young’s Modulus will be Stress/Strain= (F/A)/(L1/L) Young’s modulus \(Y\) is the elastic modulus when deformation is caused by either tensile or compressive stress, and is defined by Equation \ref{12.33}. Young's modulus E [MPa] Mechanical - 2.5 Elongation at break A ... See all rubber balls. 15 000 pound/square inch = 103 421 359.2 newton/square meter The Young's Modulus (or Elastic Modulus) is in essence the stiffness of a material. Young’s Modulus is measured during a Tensile Strength test. Dividing this equation by tensile strain, we obtain the expression for Young’s modulus: Young modulus of Rubber (small strain):(range) 0.01–0.1 GPa. Young’s Modulus is also known as tensile modulus, elastic modulus or modulus … It is dependent upon temperature and pressure however. Young’s modulus–the most common type of elastic modulus, seems to be the most important material property for mechanical engineers. Coming back to our comparison of elasticity of steel and rubber, let us understand it in terms of Young’s modulus. In other words, it is how easily it is bended or stretched. Young’s modulus formula. 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