Experimental investigation of damping flexural vibrations in glass fibre composite plates containing one- and two-dimensional acoustic black holes
Experimental investigation of damping flexural vibrations in glass fibre composite plates containing one- and two-dimensional acoustic black holes
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DOI：
10.1016/j.compstruct.2013.08.011
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发表时间：
2014-01-01
影响因子：
6.3
通讯作者：
Krylov, V. V.
中科院分区：
文献类型：
--
作者：
Bowyer, E. P.;Krylov, V. V.
本文报道了在复合材料板和板中加入幂律型压痕并将其夹杂在复合材料蜂窝夹层板中的实验研究结果。所讨论的复合材料板是具有可见的幂律型压痕的复合材料片。面板是一种复合材料，压痕被包裹在样品内。这使得面板的表面纹理类似于未加工的复合材料板（参考板）或传统的蜂窝夹芯板。在二次或高阶剖面的情况下，上述压痕作为弯曲波的二维声黑洞，可以吸收大部分入射波能量。对于本研究中测试的所有复合材料样品，除了由于复合材料损失因子的大值而已经存在的大量固有阻尼外，二维声黑洞的加入导致共振振动的阻尼进一步增加。由于所使用的复合材料的损耗系数很大，因此不需要在凹痕中添加小块的吸收层来达到理想的阻尼水平。(C) 2013 Elsevier Ltd.版权所有。
In this paper, the results of the experimental investigation into the addition of indentations of power-law profile into composite plates and panels and their subsequent inclusion into composite honeycomb sandwich panels are reported. The composite plates in question are sheets of composite with visible indentations of power-law profile. A panel is a sheet of composite with the indentations encased within the sample. This makes a panel similar in surface texture to an un-machined composite sheet (reference plate) or conventional honeycomb sandwich panel. In the case of quadratic or higher-order profiles, the above-mentioned indentations act as two-dimensional acoustic black holes for flexural waves that can absorb a large proportion of the incident wave energy. For all the composite samples tested in this investigation, the addition of two-dimensional acoustic black holes resulted in further increase in damping of resonant vibrations, in addition to the already substantial inherent damping due to large values of the loss factor for composites. Due to large values of the loss factor for composite materials used, there was no need in adding small pieces of absorbing layers to the indentations to achieve desirable levels of damping. (C) 2013 Elsevier Ltd. All rights reserved.