Dynamic visualization and wave propagation by viscoelastic impact

点击翻译按钮获取中文摘要

High-speed and low-speed impact experiments were performed to study the rheological properties of various soft matters such as agar gel and granular matter. For agar gel, a steel ball was dropped to it. We developed a way to estimate the viscoelastic properties from the image analysis of the agar gel response to the impact. While the developed method has several limitations in it, we can estimate the rheological properties by using the developed method. For granular matter, we carried out the low-speed impact (penetration) experiments. During the penetration, AE (Acoustic emission) signals were measured. By the AE method, the individual slop or rearrangement of grains network can be detected. We found that the AE events distribution obeys power law. The power law exponent was compared with the Earthquake distribution.