Kevlar纤维/氧化石墨烯混合增韧GFRP-Balsa夹芯结构界面性能研究

doi:10.19936/j.cnki.2096-8000.20260628.002

摘要/Abstract

摘要： 以玻璃纤维增强聚合物(Glass Fiber Reinforced Polymer,GFRP)-轻木夹芯结构为研究对象,进行了无增韧、Kevlar短切纤维增韧、Kevlar短切纤维与氧化石墨烯混合增韧三类夹芯梁共9根试件的三点弯曲试验。通过分析GFRP-轻木夹芯结构界面的剥离形态、裂纹扩展规律和应变能释放率等,阐明了不同增韧方式的增韧机理。试验结果表明,相比无增韧试件,混合增韧试件的剥离临界荷载提升了25.96%,平均应变能释放率提升了92.4%,表明混合增韧方法能够显著提高GFRP-轻木夹芯结构的界面韧性。结合扫描电镜图像和试验数据分析发现,Kevlar纤维的增韧机理为形成复合纤维桥接结构,而氧化石墨烯的增韧机理为树脂改性,改性后的树脂能够紧密包裹混合纤维丝,从而增加界面剥离的难度。

关键词: GFRP-轻木夹芯结构, 增韧, Kevlar短切纤维, 氧化石墨烯, 界面韧性

Abstract: The study focused on GFRP-Balsa sandwich structures, conducting three-point bending tests on a total of 9 specimens of three types of sandwich beams: non-toughened, Kevlar short fiber toughened, and Kevlar short fiber combined with graphene oxide hybrid toughened. By analyzing the interfacial delamination morphology, crack propagation patterns, and strain energy release rates of the GFRP-Balsa sandwich structures, the toughening mechanisms of different methods were elucidated. Experimental results demonstrated that, compared to non-toughened specimens, the hybrid toughened specimens exhibited a 25.96% increase in critical delamination load and a 92.4% enhancement in average strain energy release rate, indicating that the hybrid toughening method significantly improves the interfacial toughness of GFRP-Balsa sandwich structures. Scanning electron microscopy images and experimental data revealed that the toughening mechanism of Kevlar fibers involves the formation of composite fiber bridging structures, while graphene oxide modifies the resin, enabling it to tightly encapsulate the hybrid fibers, thereby increasing the difficulty of interfacial delamination.

Key words: GFRP- Balsa sandwich structure, toughening, Kevlar short fiber, graphene oxide, interfacial toughness

中图分类号:

TB332

蔡玉芝, 史慧媛, 唐柏鉴, 徐子恒. Kevlar纤维/氧化石墨烯混合增韧GFRP-Balsa夹芯结构界面性能研究[J]. 复合材料科学与工程, 2026, 0(6): 10-19.

CAI Yuzhi, SHI Huiyuan, TANG Baijian, XU Ziheng. Study on the interface properties of Kevlar fiber/graphene oxide hybrid toughened GFRP-Balsa sandwich structure[J]. COMPOSITES SCIENCE AND ENGINEERING, 2026, 0(6): 10-19.

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