The size of the strain produced in a given material is the same regardless of whether the stress is tensile or compressive, according to many experimental findings and results.
The ratio of tensile or compressive stress to longitudinal strain , represented by the symbol "," is the definition or expression of Young's modulus.
Factors affecting Young's modulus
Temperature: A measurement of a material's stiffness is its Young's modulus. The material's stiffness reduces as the temperature rises due to the material's lengthening. As a result, we can state that Young's modulus drops as the temperature rises.
When the impurity concentration is less than 10%, Young's moduli decrease roughly linearly as the impurity concentration increases, with the impurity Si causing the biggest decreasing ratio and the impurity N the smallest.