The dimension of Young's modulus is the same pressure. In the international system of units, the unit of pressure is Pascal. However, in engineering applications, the Young's modulus of each material is very large, so the unit is usually one million Pascal (MPa) or one billion Pascal (GPa).

Young's modulus is a physical quantity that describes the deformation resistance of solid materials. When a metal wire with a length of L and a cross-sectional area of S is extended by a force F, F/S is called stress, and its physical meaning is the force per unit cross-sectional area of the metal wire; Δ l/l is called strain, and its physical meaning is the elongation corresponding to the unit length of metal wire.

Extended data

The measurement of Young's modulus is of great significance for studying the mechanical properties of metal materials, optical fiber materials, semiconductors, nano-materials, polymers, ceramics, rubber and other materials, and can also be used in mechanical parts design, biomechanics, geology and other fields.

Elastic materials will produce positive strain when subjected to normal stress, which is defined as the ratio of normal stress to normal strain. The formula is written as E=σ/ε, where e stands for Young's modulus, σ stands for normal stress and ε stands for normal strain. Young's modulus is large, which means that the deformation of the material is small when compressed or stretched.

The properties of modulus depend on the properties of deformation. It can be seen from the above formula that in order to improve the rigidity EA0 of parts, that is, to reduce the elastic deformation of parts, materials with high elastic modulus can be selected and the bearing cross-sectional area can be appropriately increased. The importance of rigidity is that it determines the stability of parts in use, especially for slender bars and thin-walled members.

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