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Projectile impact testing of glass fiber-reinforced composite and layered corrugated aluminium and aluminium foam core sandwich panels: a comparative study

机译：玻璃纤维增​​强复合材料和多层波纹铝和泡沫铝芯夹芯板的弹丸冲击试验：比较研究

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摘要

E-glass/polyester composite and layered corrugated aluminium and aluminium foam core sandwich panels were projectile impact tested between 127 m/s and 190 m/s using a hardened steel sphere projectile. The corrugated aluminium cores, constructed from aluminium fin layers and aluminium interlayers and face sheets, exhibited relatively lower-plateau stresses and higher stress oscillations in the plateau region than aluminium foam cores. The applied brazing process resulted in reductions in the plateau stresses of the corrugated aluminium cores. The sandwich panels with 2- and 3-mm-thick composite face sheets and the epoxy-bonded corrugated aluminium sheet cores were perforated, while the sandwich panels with 5-mm-thick composite face sheets were penetrated in the projectile impact tests. On the other hand, the sandwich panels with aluminium foam cores were only penetrated. A simple comparison between the ballistic limits of the sandwich panels as a function of total weight revealed significant increases in the ballistic limits of the cores with the inclusion of composite face sheets. The determined higher impact resistance of the foam core sandwich panels was attributed to the relatively higher strength of the foam cores investigated and the ability to distribute the incident impulse to a relatively large area of the backing composite plate.
机译：使用硬化的钢球弹丸，对E-玻璃/聚酯复合材料以及多层波纹铝和泡沫铝芯夹心板进行了127 m / s至190 m / s的弹丸冲击测试。与铝泡沫芯相比，由铝翅片层，铝中间层和面板构成的波纹铝芯在高原区域表现出相对较低的高原应力和较高的应力振荡。所应用的钎焊过程降低了波纹铝芯的平台应力。对2毫米和3毫米厚复合面板的三明治板以及环氧粘合的波纹铝板芯进行穿孔，而5毫米复合面板的三明治板在弹丸冲击试验中穿透。另一方面，仅穿透了具有泡沫铝芯的夹心板。夹心板的弹道极限与总重量的函数之间的简单比较表明，在包含复合面板的情况下，芯子的弹道极限显着增加。所确定的泡沫芯夹芯板的更高的抗冲击性归因于所研究的泡沫芯的相对较高的强度以及将入射脉冲分配到背衬复合板的相对较大区域的能力。

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