Single and double-layer honeycomb sandwich panels under impact loading
Single and double-layer honeycomb sandwich panels under impact loading
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DOI：
10.1016/j.ijimpeng.2018.07.013
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发表时间：
2018-11-01
影响因子：
5.1
通讯作者：
Guglielmino, Eugenio
中科院分区：
文献类型：
--
作者：
Palomba, Giulia;Epasto, Gabriella;Guglielmino, Eugenio
蜂窝夹层结构具有优异的吸能能力，同时具有良好的力学性能和低密度。这些特点使它们成为运输行业的理想选择，运输行业对达到更高的安全标准越来越感兴趣。本文的目的是介绍轻量化和更有效的耐碰撞结构。对双层蜂窝夹层结构进行了分析，并通过低速冲击试验对其吸能性能进行了评价。将双层板的比能量吸收与单层蜂窝板和其他轻量化板进行比较，以评估所引入的解决方案对轻量化和耐碰撞设备的有效性和便利性。通过计算机断层扫描图像和目视检查评估冲击吸收机制。采用理论评价方法对单层冲击响应进行了研究。将结果与不同边界条件下的结果和全尺寸试验结果进行了比较。接触参数受边界条件的影响，主要取决于试样的刚度。双层面板显示一个渐进的崩溃顺序，取决于核心的安排和细胞的大小。蜂窝孔尺寸越大，冲击载荷分布越均匀，芯部受到的压缩几乎是均匀的。这样的观察结果表明，有可能获得具有控制变形的能量吸收装置。由于观察到蜂窝和压头的几何特性与接触参数之间存在一定的关系，因此初步考虑了尺寸效应的存在。
Honeycomb sandwich structures have excellent energy absorption capabilities, combined with good mechanical properties and low density. These characteristics make them ideal for the transportation industry, which has a growing interest in reaching higher safety standards.The purpose of the present paper is the introduction of lightweight and more efficient crashworthy structures. Double-layer honeycomb sandwich structures were analysed and their energy absorption capabilities were evaluated by means of low-velocity impact tests.The specific energy absorption of double-layer panels was compared to single-layer honeycomb and other lightweight panels, in order to assess the effectiveness and the convenience of the introduced solution for lightweight and crashworthy devices.The impact absorption mechanism was evaluated through Computed Tomography images and visual inspection. A theoretical evaluation was applied to investigate the mono-layer impact response. The results were compared to those obtained with different boundary conditions and with a full-scale test. Contact parameters were influenced by boundary conditions since they depend on the specimens stiffness.Double-layer panels displayed a progressive collapse sequence, depending on the core arrangement and on the cell size. Honeycomb with larger cell size showed a better distribution of the impact loading which generated an almost uniform compression of the core. Such observations suggested the possibility to obtain energy absorber devices with a controlled deformation.Preliminary considerations on the existence of a size effect were drawn, since it was observed a relation among the contact parameters and the geometrical characteristics of the honeycomb and the indenter.