聚脲弹性体复合结构抗弹道冲击性能试验

采用7.62 mm口径弹道枪装置，对聚脲弹性体和硬铝合金板组成的涂层和三明治两种复合结构进行300~450 m/s速度范围的冲击试验，并分别从聚脲层和复合结构整体的单位面密度动能耗散、结构破坏模式和耗能机制等方面上进行了研究分析.从单位面密度动能耗散的角度分析，层状涂覆结构具有最优的抗爆性能，单一铝板次之，夹层结构表现最差；结构破坏方面，复合结构中聚脲层的存在会使铝板中的弹道在出口一侧出现收缩现象，会减小铝板的变形区域；聚脲层作为背板时可一定程度上减少铝屑飞溅，防止二次毁伤.

Experimental Study on Impact Resistance of Polyurea Composite Structure

Steel-tipped 7.62 caliber projectiles had been used to impact the polyurea composite structure with the velocity from 300 mm/s to 450 mm/s. Three types of composite structure composed of LY12 aluminium plate and SPUA-502 polyurea, including uncoated aluminium plate, sandwich structure and coating structure were studied. The effectiveness of the polyurea coating and different structure in terms of reduction of the residual velocity, damage mechanism, kinetic energy absorption of the plates were presented and discussed. In terms of dissipation of kinetic energy of per unit areal density, the coating structure shows the best ability, the pure aluminium plate follows, and the sandwich structure performs the worst. The cross-section microstructure observations indicated that the polyurea coating could limit the expansion of the crater in the rear surface of aluminium plate. Also, a small amount of aluminium scraps are found in PU layers showing that the feasibility of the polyuria coating acting as a protective shield against flying particles and fragments.