冲击波与破片联合加载下聚脲增强多层抗爆结构的防护特性

In order to investigate the effect of polyurea coating on the protective performance of blast-resistant structure, a multi-layer blast-resistant structure reinforced with polyurea is proposed, and the protective characteristics of blast-resistant structure under the actions of shock wave and fragments are analyzed. The overpressure fitting formula of explosive is calculated and obtained, and out-of-plane displacement of blast-resistant structure is measured using a laser 3D scanner. Experimental results of overpressure and displacement are in good agreement with simulated results. Research results show that the position of polyurea coating has great effects on the protective ability of blast-resistant structure. The protective effect of coating located on blast-facing side of sandwich steel plate is better than those of coating located on the back-blast sides of face plate and sandwich steel plate. It can effectively reduce the penetration rate and impact number of fragments, weaken the energy of the combined load ultimately acting on the back plate,and reduce the vibration amplitude and acceleration at the center of back plate. This study can provide a reference for the design of multi-layer blast-resistant structure.