As an important type of shock absorber, rubber shock absorbers have been widely used in various types of machinery, automobiles, railway locomotives, water transportation vehicles, airplanes and other aircraft. It can be said that wherever shock absorption and isolation are required, rubber shock absorbers are required.
The reason why rubber shock absorbers are so widely used is because it effectively uses the following characteristics of rubber:
1) Rubber has high elasticity and viscoelasticity;
2) Compared with steel materials, the elastic deformation of rubber is large, and the elastic modulus is very small;
3) The impact stiffness of rubber is greater than the dynamic stiffness, and the dynamic stiffness is greater than the static stiffness, which is beneficial to reduce impact deformation and dynamic deformation;
4) The stress-strain curve is an elliptic hysteresis line whose area is equal to the vibration energy (damping) converted into heat in each vibration period, which can be adjusted by formula design;
5) Rubber is an incompressible material (Poisson's ratio is 0.5);
6) The rubber shape can be freely selected, and the hardness can be adjusted by formula design, which can meet the requirements of stiffness and strength in different directions.