Studies of the impact of blast shock waves on porous media were executed to find the methods and materials for the blast loading attenuation on different targets. The results of sound waves attenuation due to propagation through porous flexible media (for example, foams with open or closed cells) served as a background for that approach. It was shown that the transmitted pressure wave reduced its magnitude if a slab of such material is placed at some distance ahead of a protected surface [1]- [3]. But no attenuation of transmitted wave occurs if the gap does not exist (foam slab is placed right against a solid surface). The early results on amplification effects with open-cell and closed-cell flexible foams were published in [4], [5]. A comprehensive description of such phenomena in foam blocks exposed to the shock wave loading is presented in [6].
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Gelfand, B., Silnikov, M., Chernyshov, M. (2009). Modification of air blast loading transmission by foams and high density materials. In: Hannemann, K., Seiler, F. (eds) Shock Waves. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85168-4_15
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