Metal–polymer–metal hybrid sandwich panels are gaining importance in civil, automotive and aerospace applications due to their light weight and damping properties. Compared with composite materials, hybrid materials consisting of separate metal and thermoplastic parts can be recycled much more easily. Besides their applications as covering material on buildings as well as general insulation material, recycled aluminum (Al)–low-density polyethylene (LDPE)–aluminum hybrid panels yield a potential usage of light ballistic protection. In this study, a standard hybrid panel of 3·2 mm polyethylene filling and two 0·4 mm aluminum metal sheets was experimentally tested under ballistic impact. A finite-element model was used with a commercial software program and validated against the experimental results. The finite-element results show that stacking of multiple layers of panels absorbs more energy than an equivalent single-layer panel. Six layers of stacked hybrid aluminum–LDPE–aluminum panels are capable of absorbing the impact energy of a 9 mm pistol projectile, and they can be utilized as recyclable inexpensive ballistic protection materials.

中文翻译：

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评估回收的防弹材料Al–LDPE–Al夹芯板

金属-聚合物-金属混合夹芯板由于其轻量和阻尼特性而在民用，汽车和航空航天应用中变得越来越重要。与复合材料相比，由单独的金属和热塑性部件组成的混合材料可以更容易地回收。再生铝（Al）–低密度聚乙烯（LDPE）–铝混合板除了可作为建筑物的覆盖材料以及一般的隔热材料外，还具有轻型防弹的潜在用途。在这项研究中，在弹道冲击下通过实验测试了由3·2毫米聚乙烯填充物和两块0·4毫米铝金属板制成的标准混合板。有限元模型与商业软件程序一起使用，并针对实验结果进行了验证。有限元结果表明，与等效的单层面板相比，多层面板的堆叠吸收更多的能量。六层堆叠式混合铝制-LDPE-铝板能够吸收9毫米手枪弹丸的冲击能量，并且可以用作可回收的廉价防弹材料。