聚脲/铝分层复合结构的抗爆性能研究

Blast Resistance of Polyurea/Aluminum Composite Structures

为研究聚脲/铝分层复合结构的抗爆性能,对在空爆载荷下的聚脲/铝结构进行了数值模拟,并与文献中的试验结果进行对比,验证数值模型的准确性。在此基础上研究了等质量条件下,复合结构层数、复合结构中金属铝的体积分数以及聚脲层位置对靶板中心点挠度的影响,分析爆炸过程中结构的能量吸收特点。结果表明:在等质量下,聚脲/铝分层复合结构存在最优的结构设计;在所讨论的结构中,除铝体积分数为90%的4层结构外,其他结构的抗爆性能均优于均质铝板,铝体积分数为10%的一层结构的抗爆炸性能最好;聚脲涂覆位置影响结构的抗爆性能,且聚脲涂覆在背爆面时抗冲击性能更优;铝板的内能吸收是复合结构能量吸收的主要部分,铝板的内能吸收比例随着铝体积分数的增加先减小后增大。研究结果可为聚脲/铝复合结构的抗爆设计提供参考。

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.