球形破片侵彻下钢/铝复合靶板的失效模式与吸能机理

为研究复合靶板自身结构对其防护性能的影响,针对面密度相同的两层钢/铝、三层钢/铝/钢爆炸复合板以及均质钢板,采用系列弹道实验和LS-DYNA3D非线性有限元程序分析了复合靶板在球形破片侵彻作用下的失效模式和吸能机理,讨论了靶板层数、厚度和界面结合情况对失效模式的影响。研究结果表明:较其他因素而言,界面结合状态对靶板失效模式的影响最明显,当界面结合良好时,各层靶板均发生剪切冲塞破坏,而当结合界面发生拉伸失效时,较薄的背板以延性扩孔破坏为主;随着靶板总厚度的增大,靶板更易发生剪切冲塞破坏;当靶板的面密度和总厚度分别相等时,三层复合靶板的防护性能优于双层靶板。

Failure mode and energy absorption mechanism of steel/aluminum composite plates impacted by spherical fragment

In order to investigate the influence of target structure on the protective performance,series of ballistic experiments and LS-DYNA 3D finite element code were adopted to research the failure mode and energy absorption mechanism of two-layer (steel/aluminum) and three-layer (steel/aluminum/steel) explosive welded targets,as well as a monolithic steel target,which were perforated by spherical fragments.The effects of the layer number,thickness and the combination of the interface on the failure mode were analyzed based on the experimental and numerical results obtained.The results show that the influence of the combination of the target interfaces on the failure mode is the most obvious as compared with the other influencing factors.The fracture mechanism of different plates were shearing and plugging when the interface was well bonded but,when the bonding interface failed due to tension,the thinner rear plate failed mainly due to ductile prolonging deformation.With the increase of the total thickness,the targets were more apt to suffer damage resulting from shearing and plugging.The protective performance of the three-layer composite target is superior to that of the two-layer one with the same areal density and total thickness.