Explanation

The shape and size of a solid change under the action of an external force. If the external force is removed, the shape and size will be restored, that is, the deformation is reversible. It is called elasticity shape. In the elasticity stage, in the case of simple tension, the relationship between stress and strain obeys Hooke's law. elastic deformation is the change of atomic bond length (normal strain) or bond angle (shear strain) in crystal, and the elastic modulus corresponding to these changes reflects the strength of atomic bond in crystal

Classification