Abstract
Damping material is used to provide structures and machines with damping characteristics. Damping material is applied to part of the product in order to reduce noise and vibration. The improvement of damping properties is important and viscoelastic material/particle composites are focused on. Many studies have reported vibration damping characteristics of viscoelastic materials are improved by particle composite process. However, it is not clear that the relationship between the vibration damping characteristics and the conditions of the particle compounding. Hence, it is difficult to predict the damping performance by compounding condition. In this study, we investigated the effects of blending of particles on the loss factor by PET particle/natural rubber composites. Evaluating dynamic viscoelasticity was performed. As a results, it is found that loss factor of composite materials have strain amplitude dependence. We built dynamic model for composite materials. This model includes equivalent stiffness, damper and friction mechanism due to the effect of surface between particles and matrix. And we assumed that dynamic frictional force is proportional to the square of the strain amplitude. Results show that analytical values of loss factor nearly correspond to experimental data.
