摘要
为增强和测试材料结构的抗破片侵彻能力,采用聚脲、芳纶纤维和2024-T351铝合金材料,通过喷涂聚脲技术构建了聚脲/纤维铝合金复合防护结构,并对聚脲的力学性能进行测定与分析。通过结构抗破片侵彻试验和数值仿真,比较了不同涂覆厚度和方式下复合材料的防护性能,得出了不同防护结构的弹道极限速度,并分析了材料的破坏模式和机理,进而研究涂层厚度与防护效果之间的关系,确定了最佳涂覆厚度比例。研究结果表明:对于采用2 mm聚脲、2 mm芳纶纤维涂层的铝合金复合靶板,其局部损伤程度较小;与未涂覆的情况相比,该复合靶板的弹道极限速度提高了96 m/s,防护效果提升了36.64%;防护涂层厚度对弹道极限速度的提升效果有限。综合考虑面密度和材料强度等因素,数值仿真结果表明,对于4 mm铝合金板的抗破片侵彻结构,聚脲/纤维涂层的最佳厚度为4~6 mm,最佳厚度比例为聚脲与芳纶纤维的比例为64。
In order to enhance and test the fragment penetration resistance of the material structure,the polyurea/aramid fiber aluminum alloy composite protection structure was constructed by spraying polyurea technology with polyurea,aramid fiber and 2024-T351 aluminum alloy materials,and the mechanical properties of polyurea are measured and analyzed.By comparing the protection properties of composite materials under different coating thicknesses and methods,the ballistic limit velocity of different protection structures were obtained,and the failure modes and mechanisms of materials were analyzed.The relationship between coating thickness and protection effect was further studied,and the optimal coating thickness ratio was determined.The results show that the local damage degree of aluminum alloy composite plate coated with 2 mm polyurea/2 mm aramid fiber is small.The ballistic limit velocity of the coated composite target plate is increased by 96 m/s and the protective effect is increased by 36.64%compared with the uncoated condition.The thickness of the protective coating has limited effect on the ballistic limit velocity.Considering the surface density and material strength,the numerical simulation results show that the optimal thickness of polyurea/aramid fiber coating is 4 mm to 6 mm,and the optimal thickness ratio is 64 ratio of polyurea to aramid fiber for the fragmentation resistance of 4 mm aluminum alloy plate.
作者
龚晓慧
饶国宁
周如东
朱晓丰
孔德成
孟辰宇
GONG Xiaohui;RAO Guoning;ZHOU Rudong;ZHU Xiaofeng;KONG Decheng;MENG Chenyu(School of Safety Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;CNOOC Changzhou Paint and Coatings Industry Research Institute,Changzhou 213000,Jiangsu,China)
出处
《兵工学报》
北大核心
2025年第7期130-144,共15页
Acta Armamentarii
关键词
聚脲
芳纶纤维
力学性能
弹道极限速度
数值仿真
polyurea
aramid fiber
mechanical property
ballistic limit velocity
numerical simulation
