It relates stress (force per unit area) to strain (proportional deformation) along an axis or line.The basic principle is that a material undergoes elastic deformation when it is compressed or extended, returning to its original shape when the load is removed. 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. ACI 318–08, (Normal weight concrete) the modulus of elasticity of concrete is , Ec =4700 √f’c Mpa and; IS:456 the modulus of elasticity of concrete is 5000√f’c, MPa. Units. Modulus of elasticity (or also referred to as Young’s modulus) is the ratio of stress to strain in elastic range of deformation. According to. Formula (4.8) indicates that a smaller value of Poisson's ratio corresponds to a larger value of Young's modulus and a larger brittleness index. Young’s modulus is the ratio of stress, which has units of pressure, to strain, which is dimensionless; therefore Young’s modulus itself has units of pressure. Shear Modulus of Elasticity - or Modulus of Rigidity. Modulus of elasticity is also a measure of material's stiffness or resistance to elastic deformation. K is the Bulk Modulus. υ is Poisson’s Ratio. The practical units used … In FPS unit psi or ksi or psf or ksf. Ans: When the shear force is increased, the value of shear modulus also increases. For typical metals, modulus of elasticity is in the range between 45 GPa (6.5 x 10 6 psi) to 407 GPa (59 x 10 6 psi).
Young's soil modulus, E s, may be estimated from empirical correlations, laboratory test results on undisturbed specimens and results of field tests. Ec = Modulus of elasticity of concrete. Units of Elastic Modulus. G = stress / strain = τ / γ Ans: The shear modulus is related to other elastic moduli as 2G(1+υ) = E = 3K(1−2υ) where, G is the Shear Modulus. Young's modulus (E or Y) is a measure of a solid's stiffness or resistance to elastic deformation under load. Units of elastic modulus are followings: In SI unit MPa or N/mm 2 or KN/m 2. MODULUS OF ELASTICITY FOR METALS. Most commonly the units are Pascals (Pa) which is the SI unit, or pounds per square inch (psi) depending on the industry or geographical location. Modulus of Elasticity, or Young's Modulus, is commonly used for metals and metal alloys and expressed in terms 10 6 lb f /in 2, N/m 2 or Pa. Tensile modulus is often used for plastics and is expressed in terms 10 5 lb f /in 2 or GPa. Modulus of Elasticity of Concrete can be defined as the slope of the line drawn from stress of zero to a compressive stress of 0.45f’ c. As concrete is a heterogeneous material. There are other numbers which 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. Units of Modulus of Elasticity/Young’s modulus are: Nm-2 or Pa.