微粒子配合ゴムにおける界面すべりの直接観察

抄録

In recent years, miniaturization and weight reduction of mechanical structures have been advanced, however since the vibration sensitivity of the machine increases and the space for arranging the vibration damping material also decreases, vibration enough to hinder the original function is excited a problem arises. Therefore, it is considered that the development of vibration damping materials that small amounts and exhibit high vibration damping properties is useful. It is known that damping characteristics are improved by composing fine particles in a viscoelastic material, however its mechanism is unknown. From the previous research, we obtained knowledge that the loss factor changes depending on fiber orientation for composite natural rubber with fiber-shaped PET particles. From this, it is conceivable that the interface state of the filler / matrix and the strain distribution of the test piece change depending on the fiber orientation. Therefore, in this research, to investigate the filler / matrix interface, an X - ray CT image was obtained with a tensile load applied to the test piece, and the interface state observed. As a result, it was confirmed that voids were generated or grown at the fiber ends when the fiber orientation coincided with the tensile orientation. When the fiber orientation was orthogonal, it was impossible to confirm the generation and growth of voids. From the above results, it was found that separation and interfacial slippage in the fiber end and these phenomena largely influenced the strain amplitude dependence of the attenuation characteristic at composite rubber with fiber-shaped particles.