Analysis on the Influence of Multi-Layered Media on Stress Wave Propagation

The influence of multi-layered media on stress wave propagation characteristics has been analysed by the low velocity impact experiments and the corresponding numerical simulation. It shows that the wave amplitude and the actuation time are both affected by foamed materials in the layered media, and the energy absorption of multi-layered media with the foamed materials is obvious. As a result, the energy and momentum of different layer are changed when stress wave propagates in the layered media. Comparing the media including foamed aluminium with the media including foamed concrete, it has been shown that foamed concrete can lead to the lower wave amplitude, but foamed aluminium can absorb the more energy than that of foamed concrete under the condition of low velocity impacts.