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为研究芳纶短纤维对复合材料夹芯材料/结构的界面及性能的影响,对具有芳纶短纤维增韧界面的碳纤维-泡沫铝夹芯梁进行了试验和细观增韧机制研究。在夹芯梁制备过程中,在碳纤维-泡沫铝界面加入低密度芳纶短纤维薄膜,通过短纤维的桥联作用,提高夹芯梁的界面黏接性能。研究了芳纶纤维增韧对夹芯梁面内压缩性能和破坏模态的影响,采用非对称双悬臂梁(ADCB)试验测量了不同增韧参数条件下,碳纤维表板与泡沫铝芯体之间的临界能量释放率。试验结果显示:在相同增韧参数条件下,Kevlar纤维增韧夹芯梁的面内压缩性能和界面临界能量释放率均较好,而混杂长度Kevlar纤维的界面增韧效果最优。通过对试件断面的SEM观测,分析了芳纶纤维增韧的细观增韧机制。
In order to study the influence of aramid staple fiber on the interfacial properties of composite sandwich material / structure, the carbon fiber-aluminum foam sandwich beam with aramid fiber toughened interface was tested and the mesoscopic toughening mechanism was studied. In the process of sandwich beam fabrication, a low density aramid staple fiber film is added to the carbon fiber-aluminum foam interface to improve the interfacial adhesion of the sandwich beam through the bridging effect of short fibers. The effect of aramid fiber toughening on in-plane compressive properties and failure mode of the sandwich beam was studied. The asymmetric double-cantilever beam (ADCB) Between the critical energy release rate. The experimental results show that under the same toughening parameters, the in-plane compressive properties and interfacial critical energy release rate of Kevlar fiber-reinforced sandwich beams are better, while the interfacial toughening effect of Kevlar fibers with the mixed length is the best. The microscopic toughening mechanism of aramid fiber toughened was analyzed by SEM observation of the cross section of the specimen.