聚脲涂层复合结构抗破片侵彻效能研究

Study on Penetration Effectiveness of Polyurea Coated Composite Structures Against Fragments

为了研究聚脲涂层复合材料的抗破片侵彻性能,进行了以玻纤-芳纶的复合材料板为底材,在不同位置涂覆聚脲涂层的抗侵彻试验;采用3.3 g破片对靶板进行侵彻试验,获得了弹道极限,并分析了靶板和破片的破坏与耗能模式;利用Autodyn软件进行相同工况的仿真计算,结合实验结果,分析了复合结构靶板的抗弹效能。结果表明:玻纤层破坏模式为剪切破坏,芳纶层为先剪切后弯曲拉伸破坏,聚脲为弹性体的拉伸断裂,且背弹面涂覆聚脲会抑制芳纶的拉伸与分层;迎弹面涂覆聚脲相对于无涂覆玻纤-芳纶复合材料板弹道极限提升最为明显,且在等面密度的原则下,涂覆聚脲涂层后反而降低了靶板的吸能效果。

In order to study the penetration resistance of polyurea-coated composites,a glass fiber-aramid composite board was used as a substrate,and a polyurea coating was applied at different positions to resist penetration. A fragment of 3. 3 g was used. Penetration test was conducted on the target plate to obtain the ballistic limit,and the destruction and energy consumption patterns of the target plate and fragments were analyzed. The simulation calculation of the same working conditions using Autodyn software was combined with the experimental results to analyze the resistance of the composite structure target plate efficacy. The results show that the failure mode of the glass fiber layer is shear failure,the aramid layer is sheared first,then the bending and tensile failure,the polyurea is the tensile fracture of the elastomer,and the back elastic surface coating polyurea will inhibit the pull of aramid fiber stretch and stratify. The elastic surface coating of polyurea is most obvious compared to the uncoated glass-aramid composite plate,and under the principle of equal area density,coating the polyurea coating reduces the energy absorption of the target plate. effect.