Chen Chen, Wang Peng, Legrand Xavier
University of Lille, Ensait, Gemtex, F-59000 Roubaix, France.
University of Haute-Alsace, Ensisa, Lpmt, F-68000 Mulhouse, France.
Polymers (Basel). 2021 May 20;13(10):1665. doi: 10.3390/polym13101665.
This study presents a novel sandwich structure that replaces the polypropylene (PP) foam core with a carbon fiber non-woven material in the tufting process and the liquid resin infusion (LRI) process. An experimental investigation was conducted into the flatwise compression properties and Charpy impact resistance of sandwich composites. The obtained results validate an enhancement to the mechanical properties due to the non-woven core and tufting yarns. Compared to samples with a pure foam core and samples without tufting threads, the compressive strength increased by 45% and 86%, respectively. The sample with a non-woven layer and tufting yarns had the highest Charpy absorbed energy (23.85 Kj/m), which is approximately 66% higher than the samples without a non-woven layer and 90% higher than the samples without tufting yarns. Due to the buckling of the resin cylinders in the Z-direction that occurred in all of the different sandwich samples during the compression test, the classical buckling theory was adopted to analyze the differences between the results. The specific properties of the weight gains are discussed in this paper. The results show that the core layers have a negative effect on impact resistance. Nevertheless, the addition of tufting yarns presents an obvious benefit to all of the specific properties.
本研究提出了一种新型夹层结构，即在簇绒工艺和液体树脂灌注（LRI）工艺中，用碳纤维非织造材料取代聚丙烯（PP）泡沫芯。对夹层复合材料的平面压缩性能和夏比抗冲击性进行了实验研究。所得结果证实了由于非织造芯和簇绒纱线，材料的机械性能得到了增强。与纯泡沫芯样品和无簇绒线样品相比，抗压强度分别提高了45%和86%。具有非织造层和簇绒纱线的样品具有最高的夏比吸收能量（23.85 Kj/m），比无非织造层的样品高约66%，比无簇绒纱线的样品高90%。由于在压缩试验中所有不同夹层样品的树脂圆柱体在Z方向发生屈曲，采用经典屈曲理论分析结果之间的差异。本文讨论了增重的具体特性。结果表明，芯层对抗冲击性有负面影响。然而，添加簇绒纱线对所有具体性能都有明显的益处。
