聚脲/铝分层复合结构的抗爆性能研究

Numerical simulations of polyurea/aluminum structures under blast loading were carried out to study the blast resistant performance of polyurea/aluminum composite (PAC) structures. The accuracy of the numerical models was verified by the test results in related literature. Under the condition of equal masses, the effects of structural layer number, volume fraction of metal aluminum in the structure, and position of polyurea layer on the blast resistant performance of PAC structures were investigated. Meanwhile, the energy absorption characteristics of PAC structures were analyzed. The results show that the PAC hierarchical structure is the best structure design under the same mass. Except for the four-layer structure with 90% aluminum volume fraction, the other structures exhibit better performance than the homogeneous aluminum counterpart. The single-layer structure with 10% aluminum volume fraction presents the most excellent blast resistance. For polyurea-coated structures, the shock resistance of polyurea coating on the rear surface of the structure opposite to explosion is superior. Internal energy absorption of aluminum plates provide the most contribution to the overall energy absorption. The proportion of internal energy absorption of aluminum layers first decreases, and then increases with the enhancement of aluminum volume fraction. The research results can provide a reference for the anti-explosion design of PAC structures.