Hurley, Blast-related traumatic brain injury: what is known?, JNP 18, 141 16720789(2006). Gladish, Explosions and blast injuries, Ann. Gazonas, Fluid structure interactions for blast wave mitigation, J. Elsayed, Toxicology of blast overpressure, Toxicology 121, 1 (1997). Baker, Explosions in Air (The University of Texas Press, Austin, 1973) Baker, Explosions in Air (The University of Texas Press, Austin, 1973) W. This study is meaningful for evaluating and designing high-performance blast mitigation structures. Furthermore, based on these analyses, the corresponding theoretical model is proposed, and it can well explain the experimental and numerical results. The numerical results indicate that the regulation for blast pressure pulses mainly complete at the hard/soft interface, which is attributed to the reflection of pressure waves at the interface and the deformation of the soft layer compressed by the hard layer possessing kinetic energy. Correspondingly, the finite element simulation is also carried out to understand the blast mitigation mechanism. Specifically, the combination of 7 mm UHMWPE composite and 20 mm EPE foam can reduce the blast pressure amplitude by 40%. Experimental results indicate that the hard/soft structures can mitigate the blast pressure pulse into the triangular pressure pulse, through making the pulse profile flatter, reducing the pressure amplitude, and delaying the pulse arrival time. A pressure test device is designed to support the tested structure and measure the transmitted blast pressure pulses after passing through the structure. In field explosion experiment, a 7.0 kg trinitrotoluene (TNT) spherical charge is used to generate blast waves at a 3.8 m stand-off distance. The hard/soft structures were composed of ultra-high molecular weight polyethylene (UHMWPE) composite and expanded polyethylene (EPE) foam. The blast mitigation mechanism is analyzed. In this paper, we proposed a new method to evaluate experimentally and numerically the blast mitigation performance of hard/soft composite structures.
However, there is still lacking a reliable experimental methodology to effectively evaluate the blast mitigation performance when the structure directly contacts the protected target, which limits the development of protection structures. The application of hard/soft composite structure in personnel armor for blast mitigation is relatively practical and effective in realistic protection engineering, such as the shell/liner system of the helmet.
0 kommentar(er)
