Young’s modulus is the ratio of longitudinal stress and longitudinal strain. Measuring Young’s Modulus. The Young's Modulus of a material is a fundamental property of every material that cannot be changed. Young’s Modulus (Linear Elastic Region) and Yield Point (Strength) The more the value of elastic modulus means the more elastic the material is. In essence, the Young’s modulus of steel is more than the Young’s modulus of rubber. Hence, the stress/strain ratio is higher for steel. Hence, Steel is more elastic than rubber. It is dependent upon temperature and pressure however. Coming back to our comparison of elasticity of steel and rubber, let us understand it in terms of Young’s modulus. What is the modulus of rubber? The slope of this curve is the Young’s Modulus and any point on that curve is a Tangent Modulus. Note that rubber 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. Please keep in mind that Young’s modulus holds good only with respect to longitudinal strain. Young modulus of Rubber (small strain):(range) 0.01–0.1 GPa. For example, as compared to rubber, the value of young’s modulus is more for steel material (Refer to Table 2). The moduli of rubber samples are typically expressed as the stress needed to strain a rubber sample for 25%, 50%, 100%, 200% and 300%. Young’s Modulus is measured during a Tensile Strength test. So, Steel material will regain its shape more easily as compared to the rubber on the application of force. 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). Young’s Modulus is also known as tensile modulus, elastic modulus or modulus … The Young's Modulus (or Elastic Modulus) is in essence the stiffness of a material. 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… 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. Dividing this equation by tensile strain, we obtain the expression for Young’s modulus: In other words, it is how easily it is bended or stretched. 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}. As stated above, when performing a Tensile Strength test a stress-strain curve is plotted. 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 E [MPa] Mechanical - 2.5 Elongation at break A ... See all rubber balls. The higher these percentages are, the stiffer the material is. Young’s modulus–the most common type of elastic modulus, seems to be the most important material property for mechanical engineers. 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. This is reported as Modulus 25%, Modulus 50% etc. Young’s modulus formula. For the same stress, the strain of steel is lesser as compared to that of rubber. 1,500–15,000 lbf/in² (psi) 1 500 pound/square inch = 10 342 135.92 newton/square meter. 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