Material Selection for CFRP-Aluminium-Foam-Sandwiches Manufactured by a PUR Spraying Process
Material Selection for CFRP-Aluminium-Foam-Sandwiches Manufactured by a PUR Spraying Process
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DOI：
10.4028/www.scientific.net/kem.742.317
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发表时间：
2017-07
期刊：
影响因子：
--
通讯作者：
P. Rupp;P. Elsner;K. Weidenmann
中科院分区：
文献类型：
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作者：
P. Rupp;P. Elsner;K. Weidenmann
夹层结构对于要求高弯曲刚度和低重量的平面部件是理想的。通常，夹层结构是使用连接步骤制造的，将面板与芯连接。PUR喷涂工艺允许在一个工艺步骤内包括纤维的渗透、基质的固化和面板与芯的连接。此外，这种制造工艺允许使用开放单元核心结构而不渗透核心，这使得能够比较通过相同制造工艺组装的不同材料配置。这些材料的选择，在一个恒定的弯曲刚度的夹层复合材料的最低可能的质量的目的，是系统地显示在thiswork.It可以表明，弯曲模量计算组件的属性与实验达到的值很好地匹配，只有少数例外。通过计算得到的最佳弯曲模量、面板厚度和有效密度与实验值吻合较好。以开孔泡沫铝为芯材的夹层复合材料的质量比弯曲刚度高于以闭孔泡沫铝为芯材的夹层复合材料，但高于以Nomex蜂窝为芯材的夹层复合材料。
Sandwich structures are ideal for planar parts which require a high bending stiffness ata low weight. Usually, sandwich structures are manufactured using a joining step, connecting theface sheets with the core. The PUR spraying process allows to include the infiltration of the facesheet fibres, the curing of the matrix and the joining of the face sheets to the core within one processstep. Furthermore, this manufacturing process allows for the use of open cell core structures withoutinfiltrating the core, which enables a comparison of different material configurations, assembled bythe same manufacturing process. The selection of these materials, with the aim of the lowest possiblemass of the sandwich composite at a constant bending stiffness, is displayed systematically within thiswork.It could be shown that the bending modulus calculated from the component properties matched theexperimentally achieved values well, with only few exceptions. The optimum of the bending modulus,the face sheet thickness and the resulting effective density could be calculated and also matched theexperimental values well. The mass-specific bending stiffness of the sandwich composites with corestructures of open cell aluminium foams was higher than with closed cell aluminium foams, but wasexceeded by sandwich composites with Nomex honeycomb cores.