Abstract The aim of the present study is to investigate the effect of introducing an elastomer layer into conventional fiber metal laminates on their perforation resistance. Natural compounded rubber as elastomeric media and glass/epoxy composite were sandwiched in between two layers of aluminum 6061-T6 and then the resulted structure was perforated by a 10 mm diameter hemispherical projectile at different impact velocities. Residual velocities were recorded by a high speed camera via a shadowing technique. Results showed that an elastomer layer located nearer to frontal face had a better energy absorbing performance due to load spreading; besides, by increasing the impact velocity the elastomer performs more efficiently because of the elastomer damage initiation point movement toward the periphery of the stretched area. Numerical simulation of penetration process was accomplished using the advanced finite element code of LS-DYNA. Finally, a numerical parametric study was performed to assess the effect of elastomer thickness on the energy absorption efficiency (EAE) of the whole structure. Based on the obtained results, adding an elastomeric layer into the structure is more beneficial than composite thickening at the same thickness in terms of improving EAE and reducing areal density.

中文翻译：

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弹性体层状纤维金属层压板 (EFML) 冲击响应的实验和数值研究

摘要 本研究的目的是研究将弹性体层引入传统纤维金属层压板对其抗穿孔性的影响。将天然复合橡胶作为弹性介质和玻璃/环氧树脂复合材料夹在两层铝 6061-T6 之间，然后用直径 10 毫米的半球形弹丸以不同的冲击速度对所得结构进行穿孔。剩余速度由高速摄像机通过阴影技术记录。结果表明，由于载荷分散，靠近正面的弹性体层具有更好的能量吸收性能；此外，由于弹性体损伤起始点向拉伸区域的外围移动，因此通过增加冲击速度，弹性体的性能会更高。利用LS-DYNA的先进有限元程序完成了穿透过程的数值模拟。最后，进行了数值参数研究以评估弹性体厚度对整个结构的能量吸收效率 (EAE) 的影响。基于所得结果，在提高EAE和降低面密度方面，在结构中加入弹性体层比在相同厚度下增厚复合材料更有利。