Shock Wave Reflection and Attenuation in the Combined Blast Inhibitors

Simulation of an explosion-proof bin made of relaxation material

“…Numerical analysis [1,2,[5][6] and experimental results [1][2][3][4][5][6][7] indicate that the absorption of explosion energy by such multiphase material leads to a significant (sometimes in dozens of times) decrease in the amplitude (blast overpressure) of the blast wave and, simultaneously, to a noticeable (in several times) decrease in the pressure impulse of its positive phase. As a result, as the corresponding damage diagrams show [11][12], it is possible to reduce the damaging effect of the blast wave to an acceptable (safe for people and structures) level at a distance of 2-3 meters from the epicenter of a condensed high explosive (HE) up to several kilograms of TNT equivalent mass (kg TNT). The phenomenon of suppression of the blast-wave effects by relaxation multiphase material of abnormally high compressibility (Gelfand-Silnikov effect [6]) manifests itself especially clearly when it is necessary to provide explosion protection in confined spaces, under conditions of multiple reflection, interaction (with amplification) and focusing of shock and blast waves [9].…”

“…To reliably describe the parameters of blast protective devices, allowing one to determine its effective mass, composition and location of blast-absorbing structures made of multiphase relaxation media, it is necessary to select a mathematical model that adequately describes the influence of a highly compressible relaxation material on a strong shock wave. In addition, it is necessary to evaluate how the effectiveness of blast wave suppression depends of the amount ("plug size" [10][11][12][13]) of the relaxation media, the location of this "plug" and the density of this working multiphase material.…”

“…and these strain rates (diagonal elements of the strain tensor) are related to the rate of change of volume by the following condition (12):…”