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Numerical investigation of a three point bending test on sandwich panels with aluminum skins and Nomex? honeycomb core

机译：铝皮和Nomex？夹芯板三点弯曲试验的数值研究蜂窝芯

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摘要

An experimental-numerical methodology for the investigation of three point bending test (TPBT) on sandwich panels with Al skins and Nomex? Honeycomb core is presented. A dedicated focus on numerical models is presented. Using data obtained from flatwise compressive tests, a highly detailed FE model (micromechanical level), has been built. It has, therefore, been possible to reproduce, with an elevated grade of similarity, the real behavior of sandwich panels in TPBT. Particular attention has been paid to verify the accurate modeling of the crushing behavior of the core during the last part of TPBT. Numerical results and experimental data have been compared. This comparison has not only been based on a load-displacement curve, but has been further exemplified by detailed photographical images, throughout the whole loading process, of the local behavior of the cells crushing. The influence of various parameters (friction and relative position of the puncher) has been also evaluated from a numerical point of view.
机译：用于研究具有铝皮和Nomex？的夹芯板的三点弯曲试验（TPBT）的实验-数值方法。介绍了蜂窝芯。专门介绍了数值模型。利用从水平压缩试验获得的数据，建立了高度详细的有限元模型（微机械水平）。因此，有可能以较高的相似度复制TPBT中夹芯板的真实行为。在TPBT的最后阶段，已经特别注意验证岩心破碎行为的准确模型。比较了数值结果和实验数据。这种比较不仅基于载荷-位移曲线，而且在整个装载过程中，通过详细的摄影图像进一步说明了细胞破碎的局部行为。还从数值的角度评估了各种参数（打孔器的摩擦和相对位置）的影响。

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