Specific bending stiffness of in-mould-assembled hybrid sandwich structures with carbon fibre reinforced polymer face sheets and aluminium foam cores manufactured by a polyurethane-spraying process
Specific bending stiffness of in-mould-assembled hybrid sandwich structures with carbon fibre reinforced polymer face sheets and aluminium foam cores manufactured by a polyurethane-spraying process
复制标题
DOI：
10.1177/1099636217725250
复制
发表时间：
2019-11
影响因子：
3.9
通讯作者：
P. Rupp;P. Elsner;K. Weidenmann
中科院分区：
文献类型：
--
作者：
P. Rupp;P. Elsner;K. Weidenmann
本文研究了新型混杂夹层结构的弯曲刚度与重量比。夹层板由碳纤维增强聚合物制成的面板、铝泡沫芯和泡沫聚氨酯界面组成。夹层板在单一步骤中生产，同时渗透面板纤维并将面板连接到芯。通过力学性能测试，研究了不同面板结构和厚度、芯层结构和界面性能的试样。进行了夹层复合材料的准静态四点弯曲和平板压缩试验，以及面板的拉伸试验。拉伸和压缩试验的结果被集成在分析模型中，描述了夹层刚度取决于负载情况和面板体积分数。在四点弯曲试验中测得的复合材料的有效杨氏模量与从单组分面板和芯计算的建模有效弯曲模量良好相关。该模型低估了弯曲试样的有效密度。可以表明，这种低估是由于将面板连接到芯部的聚氨酯泡沫造成的，因为该聚氨酯的质量不包括在模型中。
In this paper, the bending stiffness-to-weight-ratio of novel hybrid sandwich structures is investigated. The build-up of the sandwich panels consisted of face sheets made from carbon fibre reinforced polymer, aluminium foam cores and an interface of foamed polyurethane. The sandwich panels were produced in a single step, infiltrating the face sheet fibres and connecting the face sheets to the core simultaneously. By means of mechanical characterization, specimens with several variations of face sheet architecture and thickness, core structure and interface properties were examined. Quasi-static four-point bending and flatwise compression tests of the sandwich composites were conducted, as well as tensile tests of the face sheets. The results of the tensile and compressive tests were integrated in analytical models, describing the sandwich stiffness depending on the load case and the face sheet volume fraction. The effective Young’s modulus of the composite, measured in the four-point bending test, correlates well to the modelled effective bending modulus calculated from the single components face sheet and core. The model underestimates the effective density of the bending specimens. It could be shown that this underestimation results from the polyurethane foam connecting the face sheets to the core, as the mass of this polyurethane is not included in the model.