Pressure transmission in aluminum foams impacted by underwater explosion waves

The interaction of underwater explosion waves with aluminum foam plates with different cell types is investigated. It is shown that the transmitted wave that passed through a closed-cell sample can be decomposed into two parts, one with a low-frequency content, which corresponds to the gas pressure in the pores, and one with a high-frequency content, which is argued to be a coupling of waves transmitted by the matrix and wave interactions between the fluid and the matrix of the medium.