Mitigation Effects of Nanoporous Material Liquid System on losed-field Blast Loading

To explore the application value of nanoporous material liquid systems (NMLS) in enhancing the blast resistance of fiber shells, experimental and numerical studies were conducted on the blast mitigation effects of nano-porous silica water suspensions. Internal explosion experiments were carried out to compare the blast resistance performance of three different hollow cylindrical composite structures: empty chamber-shell, water-filled chamber-shell, and NMLS-filled chamber-shell. The results showed minimal differences in fiber breakage among these three structures, indicating that neither water nor NMLS exhibited a significant blast mitigation effect. Numerical models matching the experimental conditions were established, and the mechanical behavior of NMLS was described using a compaction equation of state validated by dynamic impact experiments. The simulation results revealed that both water and NMLS significantly increased the internal blast loading on the shell, with peak pressures reaching 1. 7 and 1. 9 times that of the baseline (no liquid layer), respectively. The more severe loading enhancement caused by NMLS was attributed to the higher initial pressure rise experienced by the shock wave propagating through the NMLS layer under the catch-up effect. Further numerical analyses over a broader range of parameters showed that water consistently exhibits a blast-enhancing effect, while the effect of NMLS transitions from enhancement to mitigation as the standoff distance increases, the charge mass decreases, or the liquid layer thickness increases. This transition was due to a better match between the energy absorption capacity of NMLS and the blast loading, leading to greater attenuation of the shock wave pressure after passing through the NMLS layer.