University. The usual English unit is pounds per square inch (PSI) or mega PSI (Mpsi). In solid mechanics, Young's modulus (E) is a measure of the stiffness of an isotropic elastic material. For designing the load-carrying capability of steel and concrete structures, civil engineers use Young’s modulus along with allowable deflection data. It must … . It is also known as the stiffness to weight ratio or specific stiffness.High specific modulus materials find wide application in aerospace applications where minimum structural weight is required. Your email address will not be published. Young's modulus is named after the 19th-century British scientist Thomas Young. Young's modulus is the ratio of stress to strain. I am a Mechanical Engineer turned into a Piping Engineer. Young’s modulus can be used to calculate various other moduli (for example rigidity modulus, bulk modulus, etc) of a material. The basic concept behind Young's modulus was described by Swiss scientist and engineer Leonhard Euler in 1727. Stress-Strain Graphs . Let us consider the initial volume of an object is V1.Pressure P is applied to all surfaces of the object.Due to this pressure, the volume got decreased and the new volume is V2. E is Young's modulus, usually expressed in, F is the force of compression or extension, A is the cross-sectional surface area or the cross-section perpendicular to the applied force, Δ L is the change in length (negative under compression; positive when stretched). Young's modulus is a measure of the ability of a material to withstand changes in dimension when under dimension wise tension or compression. See also: Difference between stress and strain. Y = σ ε. I am very much passionate about blogging and always tried to do unique things. A purist might argue that the units are fine if the dimensionless ratio is left in (i.e. Young’s modulus is defined mathematically as the ratio of the longitudinal stress to the strain within the elastic range of the material.eval(ez_write_tag([[580,400],'whatispiping_com-medrectangle-3','ezslot_4',626,'0','0'])); eval(ez_write_tag([[300,250],'whatispiping_com-medrectangle-4','ezslot_6',658,'0','0']));As explained in the article “Introduction to Stress-Strain Curve“; the modulus of elasticity is the slope of the straight part of the curve. Young’s modulus is a proportionality constant that relates the force per unit area applied perpendicularly at the surface of an object to: asked Oct 14, 2019 in Physics by Shivam01 (81.9k points) equilibrium; elasticity +1 vote. Working a material or adding impurities to it can produce grain structures that make mechanical properties directional. Sören Ehlers Second Examiner: D.Sc. Surge Relief Valve: Definition, Function, Types, Sizing, Selection. It is used to describe the elastic properties of objects like wires, rods or columns when they are stretched or compressed. For structural design it is standard practice to consider the unit weight of structural steel equal to γ = 78.5 kN/m 3 and the density of structural steel approximately ρ = 7850 kg/m 3. Y = σ ε. Bulk modulus. They are (a) Young’s Modulus (2) Shear Modulus (3) Bulk modulus. The gradient of this graph is then the Young Modulus. A modulus is literally a "measure." This is a specific form of Hooke’s law of elasticity. Stress is measured in units of pressure and strain is dimensionless. The SI unit of modulus of elasticity (E, or less commonly Y) is the pascal (Pa or N/m²); the practical units are megapascals (MPa or N/mm²) or gigapascals (GPa or kN/mm²). Modulus of elasticity of structural steel. This table contains representative values for samples of various materials. AppliedStatics (eme1016) Uploaded by. All of them arise in the generalized Hooke's law: . 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