爆炸冲击波作用下聚氨酯- 半球夹芯结构的动态响应

Improvement of blast resistance of explosion-proof equipment has become a popular research topic. The current explosion-proof equipment is mainly made of metal, generally having considerable weight, the use of lattice sandwich structure can achieve lightweight. Lattice sandwich structure has good energy absorption efficiency and excellent mechanical properties at high strain rates, but the non-deformable hemispherical lattice has not been considered in the previous explosion protection research, and the research on composite polyurethane foam explosion-resistant sandwich structure is even more rare. In view of this, a new type of polyurethane-hemispherical sandwich structure is proposed in considering the energy absorption of polyurethane foam and the arch deformation resistance of hemispherical structure, and a combination of experiment and numerical simulation is used to study the dynamic response of polyurethane-hemispherical sandwich structure under the blast shockwave loading. The results show that the center point displacement of polyurethane-hemisphere sandwich structure with the approximate surface density is the smallest under 0. 65 m blast impact of 500 g TNT, which is 30% and 35% smaller than that of aluminum plate and pure hemisphere sandwich plate, respectively. The pure hemisphere sandwich plate absorbs the most energy but has the largest deformation, and the energy absorption of polyurethane-hemisphere sandwich structure and aluminum plate is 85% and 63% of that of the pure hemisphere sandwich plate, respectively, which shows that the incorporation of polyurethane has a significant role in ensuring the energy absorption. It can be seen that, compared with the aluminum plate, the polyurethane-hemispheres sandwich structure can effectively reduce the speed and stress concentration of the target plate while ensuring the energy absorption efficiency.