泡沫铝夹芯结构对中低速FSP的抗侵彻特性研究

Aluminum foam sandwich structures subjected to the impact by low-medium velocity FSP

为研究泡沫铝夹芯结构的不同组合形式在中低速FSP侵彻下的抗弹性能及破坏机理,开展了系列弹道试验,分析了夹芯结构的破坏模式,得到了前后面板厚度大小、后面板分层对夹芯结构抗弹性能的影响。研究结果表明:在中低速FSP侵彻下,泡沫铝芯材发生了胞壁的绝热剪切破坏,其背弹面发生明显的撕裂破坏;前面板发生绝热剪切破坏,弹孔周围产生明显的碟形弯曲变形;后面板发生塑性变形和拉伸破坏,后面板较薄时,还相应出现花瓣开裂现象。在总面密度相同的情形下,夹芯结构的后面板越厚,整体单位面密度吸能越高,抗弹性能越好;将后面板分层后,整体抗弹性能较不分层有所提高。

In order to investigate the anti-penetration performance and failure modes of aluminum foam sandwich structures under the impact of low-medium velocity fragment simulator projectile(FSP),a series of ballistic experiment were carried out,the failure modes in different conditions were analysed and the influences of the thickness of front and rear sheets and the rear sheet delamination on the ballistic performance were discussed.The experiment results indicate that the foam core fails in the mode of through-thickness shearing and tearing by the low-medium velocity impact.The failure mode of the front face sheet is shear plugging,and obvious disc deformation around the bullet hole can be observed.The rear face sheet fails in shear fracture and plastic deformation,and the petal cracking occurs when the rear face sheet is thin.The ballistic performance will be better when the rear face sheet is thick or the rear face sheet is sliced.