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A comparative study of blast resistance of cylindrical sandwich panels with aluminum foam and auxetic honeycomb cores

机译：铝泡沫铝泡沫型砂芯片砂浆耐药性比较研究及扶手蜂窝芯

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摘要

The dynamic response of cylindrical sandwich panels with aluminum foam core, hexagonal honeycomb core, and auxetic honeycomb core are compared numerically. A novel curved auxetic honeycomb core is designed, and the finite element models are built by employing ABAQUS-Explicit. To calibrate the numerical models, the experiments of sandwich panels with honeycomb core and aluminum foam cores are modeled. And the numerical results have a good agreement with the experiment date. The calibrated numerical models are used to simulate the dynamic response of cylindrical panels subject to external blast loadings. It is found that the cylindrical panels with auxetic honeycomb cores have a better performance than that with aluminum foam cores and hexagonal honeycomb cores in resisting blast loadings. A material concentration effect was observed in the auxetic honeycomb core due to the negative Poisson's ratio (NPR) effect. According to parameter studies, it is concluded that with the increase of curvature and face sheet thickness the blast-resistance of panels with both auxetic honeycomb core, hexagonal honeycomb core, and foam cores increased obviously, especially the panels with auxetic honeycomb cores. For the panels with auxetic honeycomb cores, increasing the back face sheet thickness can improve the blast-resistance performance more efficiently than increasing the thickness of front face sheet, which is opposite for the panels with foam cores and hexagonal honeycomb cores. Auxetic cores with a smaller unit cell aspect ratio and a smaller unit cell length ratio has a larger Poisson's ratio, and achieves better blast resistance performance. These simulation findings can guide well the theoretical study and optimal design of cylindrical sandwich structures subject to external blast loading. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：用铝泡沫芯，六边形蜂窝芯和辅助蜂窝芯的圆柱夹层面板的动态响应在数值上进行了数值比较。设计了一种新颖的弯曲扶手蜂窝核心，通过采用ABAQUS显式建造有限元模型。为了校准数值模型，建模了夹层面板和铝泡沫芯的夹层面板的实验。数值结果与实验日期吻合良好。校准数值模型用于模拟圆柱面板受外部爆破载荷的动态响应。研究发现，与拉胀蜂窝芯圆柱板具有比铝泡沫芯和抵御爆炸载荷六角形蜂窝芯材有更好的表现。由于负泊松比率（NPR）效应，在扶手蜂窝核中观察到材料浓度效应。根据参数研究，得出结论是，随着曲率和面板厚度的增加，面板与辅助蜂窝芯，六边形蜂窝芯和泡沫核心的爆炸电阻显然，尤其是带扶手蜂窝核心的面板。对于具有辅助蜂窝芯的面板，增加背面厚度可以比增加前面板的厚度更有效地提高爆破性能，这与具有泡沫芯和六边形蜂窝芯的面板相对。具有较小单元电池纵横比的辅助核心和较小的单位电池长度比具有较大的泊松比，并实现了更好的抗爆破性能。这些仿真调查结果可以指导圆柱形夹层结构的理论研究和最优设计，其外部爆破载荷。 （c）2019年Elsevier Masson SAS。版权所有。

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