Carbon-fiber and aluminum-honeycomb sandwich composites with and without Kevlar-fiber interfacial toughening
Carbon-fiber and aluminum-honeycomb sandwich composites with and without Kevlar-fiber interfacial toughening
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DOI：
10.1016/j.compositesa.2014.08.017
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发表时间：
2014-12
影响因子：
8.7
通讯作者：
S. Shi;Zhi Sun;Xiaozhi Hu;Hao-ran Chen
中科院分区：
文献类型：
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作者：
S. Shi;Zhi Sun;Xiaozhi Hu;Hao-ran Chen
本文研究了碳纤维和铝蜂窝夹层复合材料的界面结合及其在弯曲和单轴压缩下的结构性能。研究了在碳纤维面片与铝蜂窝芯材的界面处进行短芳纶纤维界面增韧的可行性和有效性。结果表明，树脂与芳纶短纤维在界面处原位形成的粘接接头有效地形成了复合材料。突出芳纶短纤维的游离端，连接或桥接面片和芯材，有效地增加了粘接接头两侧的粘接接触面积，在界面开裂时导致了强烈的纤维桥联。结合详细的断口观察，解释了增强胶片的增韧和增强机理。
Interfacial bonding, essential to carbon-fiber and aluminum-honeycomb sandwich composites and their structural performance, was investigated under bending and uniaxial compression in this study. The feasibility and effectiveness of short Kevlar-fiber interfacial toughening at the interface between the carbon-fiber face sheets and aluminum-honeycomb core were examined. It was observed that the adhesive joint, in-situ formed from resin and short Kevlar fibers at the interface effectively became a composite. Protruding free fiber ends of the short Kevlar fibers, connecting or bridging the face sheets and core, had effectively increased the adhesion contact areas at both sides of the adhesive joint, leading to strong fiber-bridging in case of interfacial cracking.The peak load and energy absorption of the sandwich composites, with and without the short Kevlar-fiber interfacial toughening, were compared with predictions from analytical models. Toughening and strengthening mechanisms of the reinforced adhesive fillets were explained together with detailed fractography observations.