Explanation

"Elastic modulus" is usually expressed by "E", which is a mechanical property of materials and measures the ratio of stress to strain of materials in elastic deformation stage. elastic modulus characterizes the ability of materials to resist elastic deformation, specifically, it reflects the stiffness of materials. The greater its value, the more difficult it is for materials to undergo elastic deformation. elastic modulus is one of the most common properties of elasticity materials, which is usually not affected by composition and microstructure. It can keep stable under various changes of materials, including temperature change. However, for anisotropic materials, elastic modulus can be a function of crystal direction. elastic modulus is usually divided into different types, including: Young's Modulus: it is represented by the symbol "E", which describes the elasticity properties of materials in tension or compression. Shear modulus: it is represented by the symbol "G", which measures the elasticity property of materials under shear stress. Poisson's ratio: using symbols“ ν "It indicates the shrinkage degree of materials in the vertical direction when it is stretched in one direction. For some materials that do not conform to Hook's Law Materials, such as wood, marble, concrete, etc., people sometimes use different definition methods such as origin tangent elastic modulus, tangent elastic modulus, secant elastic modulus, and chord elastic modulus. These methods are used to describe different parts of the stress-strain curve of materials. These methods are usually used to better adapt to the nonlinear behavior of materials. The use of these correction methods is reasonable because the elasticity properties of some materials may not conform to Hook's Law.

Classification