Performance of steel structure materials

The physical properties of the metal material of the steel structure grid are mainly reflected in its mechanical properties.

Any mechanical parts will be subjected to external forces (ie loads) during processing and use. The properties of materials under load are called mechanical properties of materials, including strength, plasticity, hardness, impact toughness, fatigue strength and other properties.

Under the action of external force, the steel structure grid material will cause changes in size and shape. This change in size and shape is called deformation. Deformation can generally be divided into elastic deformation and plastic deformation. Elastic deformation refers to the deformation that disappears with the disappearance of the load; plastic deformation refers to the remaining deformation when the load disappears.

1. Strength refers to the ability of a material to resist plastic deformation and fracture under external force. The greater the ability to resist external forces, the higher the strength.

2. Plasticity is the ability of a material to produce plastic deformation under external force. There are two commonly used plastic indexes: elongation after fracture and reduction of area.

3. Hardness is a comprehensive performance index that characterizes the elasticity, strength and plasticity of metal materials. Practice has proved that the higher the hardness of general materials, the better the wear resistance and the higher the strength.

4. Impact toughness refers to the measurement of the strength, plasticity, hardness and other mechanical properties of metal materials under static load conditions. However, some parts are affected by impact loads during work, and it is necessary to study the impact toughness of these parts under impact loads.

5. Fatigue strength refers to the effect of periodic stress on mechanical parts during operation. Although the stress is lower than the yield strength of the material, cracks or sudden damage will appear after a long time. This is called fatigue failure. Guangxi Steel Structure Engineering