Safety requirements for transportation of wooden building materials

The main characteristics of elasticity are:
1. Modulus of elasticity (Young's modulus): It is the most important parameter that determines the elasticity of the material. Modulus of elasticity provides the height and strength that a material exhibits against deformation. The modulus of elasticity of the material is expressed in units of force per square meter (Pa).
2. Maximum Unchanged Strain (Ultimate Strain): This amount of deformation is the largest amount of deformation that the material can take without maximum change. This quantity represents how elastic the material will be.
3. Resilience: This represents the elastic potential energy retained by the material in the process of elasticity. As the amount of rebound period increases, it refers to the amount of energy stored in the elastic process.
4. Recovery: This property represents the ability of the material to return to its original state after elastic deformation. That is, when the material is returned to its original state after deformation, it should not return to its honeycomb shape, but should return to its original shape and size.
These properties are related to the mechanical properties of wood materials and vary depending on the characteristics of the material, such as its molecular structure, structural elements, and construction methods. These properties are important in determining how the material is constructed and handled, and in determining the areas of its use.
The change in the elastic properties of wood materials is related to the molecular structure, structural elements, thermodynamic properties, changes in the crystal structure and physical properties of the material.
Changes in the elasticity properties of wood may be due to several factors. These factors can be:
1. Microstructural changes: Changes in the microstructure of the material, such as changes in the crystal structure, changes in crystal aspects, the amount and nature of dislocations, light diffraction, and other factors affect the elastic properties of the material. . Microstructural changes can be caused by heating, tracking, deformation, processing and other processes of the material.
2. Heat and cold resistance: The heating and cold resistance of the material can affect the elasticity properties. By heating the material, a change in the crystal structure and a change in the bonds between atoms can occur, which leads to a change in the elasticity properties.
3. Molecular composition and chemical changes: Changes in the molecular composition, chemical composition and structure of the material can also affect the elastic properties. Chemical reactions, substitutions, reactions with external elements and other chemical changes lead to changes in the elastic properties of the material.
4. Deformation and external forces: Deformation and external forces of the material can affect the elastic properties. Light, pressure, control forces and other external forces cause changes in the elasticity of the material.
5. Aggregate states: Changes in the aggregate states of the material, for example, crystallization, melting, phase changes can also affect the elastic properties. Changes in the state of the aggregate lead to changes in the structure and transformation of the material.