Despite many potential use of aluminum sandwiches in advanced industries, their poor performance in damping and sound transmission demands new challenges for improvement. This study aims to improve dynamic performance of these sandwiches using hybrid face sheets in the form of Glass Laminate Aluminum Reinforced Epoxy (GLARE). While parameters related to the aluminum honeycomb core were kept constant, the effects of different fiber orientations of the GLARE on the fundamental natural frequency, equivalent flexural modulus, and especially damping values were investigated. The dynamic values of the structures have been measured using a specially designed non-contact vibrating beam test with free-free end conditions. A comparison of the sandwiches with the GLARE and with bare aluminum face sheets has also been made to find out their differences in the dynamic performance. The experimental results were compared to those from a numerical modal analysis via the Altair Hyperworks 2019 Software. The results have shown that the maximum equivalent modulus is obtained from the specimen with the unidirectional (0°) fibers, and the minimum value is from that with the 90° ones. But the opposite is the case if their Specific Damping Capacity values are compared. The values of the specimens with 0°/90° and 0°/45° fibers are on moderate levels. Considerable increments between 54% and 172% are found in the damping values of the specimens with GLAREs, compared to those with the bare aluminum face sheets. The results from the experimental and numerical works have been found in a good agreement.

中文翻译：

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玻璃增强铝层压板环氧树脂对铝基夹层结构的阻尼贡献

尽管铝三明治在先进工业中有许多潜在用途，但它们在阻尼和声音传输方面的较差性能需要新的改进挑战。本研究旨在使用玻璃层压铝增强环氧树脂 (GLARE) 形式的混合面板来提高这些三明治的动态性能。在保持与铝蜂窝芯相关的参数不变的同时，研究了 GLARE 的不同纤维取向对基本固有频率、等效弯曲模量，尤其是阻尼值的影响。结构的动态值已使用专门设计的非接触式振动梁测试进行了测量，该测试具有自由端条件。还对三明治与 GLARE 和裸铝面板进行了比较，以找出它们在动态性能方面的差异。实验结果与通过 Altair Hyperworks 2019 软件进行的数值模态分析的结果进行了比较。结果表明，单向（0°）纤维试样的等效模量最大，90°纤维试样的等效模量最小值。但是，如果比较它们的比阻尼能力值，情况则相反。0°/90°和0°/45°纤维试样的数值处于中等水平。与裸铝面板相比，带有 GLARE 的样品的阻尼值增加了 54% 到 172% 之间的相当大的增量。