Polyurethane Anti-abrasion Sheet-vibration Absorption

The  property of polyurethane elastomer: vibration absorption

The effect of polyurethane elastomer on alternating stress shows obvious hysteresis. In this process, part of the energy of the external force is consumed by the internal friction of the elastomer molecules and converted into heat energy. This property is called the vibration absorption property of the material, and can also be called the energy absorption property or damping property. The vibration absorption performance is usually expressed by damping coefficient(damping). The attenuation coefficient represents the percentage of energy applied to the deformed material that can be absorbed. It is related not only to the properties of materials, but also to the ambient temperature and vibration frequency. The higher the temperature, the lower the attenuation coefficient, the higher the vibration frequency and the greater the absorbed energy. When the frequency is close to the relaxation time of macromolecules (the same order of magnitude), the absorbed energy is the largest. Polyurethane elastomer can absorb 10% ~ 20% of vibration at room temperature, which is better than butyl rubber. It is suitable for absorbing a large impact force when the deformation amplitude is small and absorbing a small impact force when the deformation amplitude is large. The table shows the attenuation values of various hardness polyurethane elastomers (vulcollan) at 20 ~ 100 ℃.

                                                               Attenuation coefficient of polyurethane elastomer%

                                                                           (Vibration frequency100~1000r/s)

In addition, it should be pointed out that the hysteresis phenomenon generates endogenous heat, which increases the elastic body temperature. As the temperature of the elastic body rises, its resilience increases and its vibration damping performance decreases. Therefore, the balance of various performances should be considered when setting the vibration damper.

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