摘要
选用微胶囊作为改性材料,采用热压机层压成型工艺制备出微胶囊层间增韧T300碳纤维/环氧树脂(CF/EP)复合材料。通过双悬臂梁(DCB)Ⅰ型层间断裂试验评估了CF/EP复合材料的增韧效果。利用超声导波技术对普通CF/EP复合材料和增韧CF/EP复合材料层间力学性能进行评价。通过SEM对CF/EP复合材料层间断面微观形貌进行观察,以揭示微胶囊的增韧机制,同时对超声导波检测结果进行辅助说明。结果表明,微胶囊以团聚形式分布在层间基体中,可以有效提高CF/EP复合材料的层间断裂韧性。微胶囊的填充改变了CF/EP复合材料层间基体特性,增加了导波传播过程中的衰减,导致响应信号峰值降低。同时,团聚的微胶囊改变了CF/EP复合材料对于中心频率125 kHz五峰波激励的振动响应,导致中心频率在信号频谱中的幅值低于普通CF/EP复合材料。
The interlaminar-toughening T300 carbon fiber/epoxy(CF/EP)composites with agglomerate microcapsules were prepared using hot-compaction laminating technology.The toughening effect was evaluated through modeⅠinterlaminar fracture tests conducted on double cantilever beam(DCB)CF/EP composites.The interlaminar properties of virgin and toughened CF/EP composites were evaluated by ultrasonic guided wave technology.The microstructures of interlaminar fracture surfaces of CF/EP composites were observed by SEM to reveal the toughening mechanism of microcapsules and explain the ultrasonic guided wave detection results.The results indicate that the microcapsules are distributed in the interlamination matrix resin in the form of agglomeration,which effectively improve the interlaminar fracture toughness of CF/EP composites.The filling of microcapsules changes the characteristics of the interlaminar matrix of the CF/EP composites,which increases attenuation of the propagating guided waves and causes the response signal peak to decrease.Meanwhile,the agglomerate microcapsules change the vibration response of the CF/EP composites to the excitation of the five-peak wave with a center frequency of 125 kHz,resulting in the amplitude of the center frequency in the signal spectrum being lower than that of the virgin CF/EP composites.
作者
王奔
于晓启
赵国旗
骆英
郝文峰
WANG Ben;YU Xiaoqi;ZHAO Guoqi;LUO Ying;HAO Wenfeng(National Center for International Research on Structural Health management of Critical Components,Jiangsu University,Zhenjiang 212013,China;Institute of Structural Health Monitoring,Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2021年第3期788-796,共9页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(11872025)。
关键词
团聚微胶囊
层间增韧
碳纤维(CF)
环氧树脂(EP)
复合材料
力学性能评价
超声导波
agglomerate microcapsules
interlaminar toughening
carbon fiber(CF)
epoxy(EP)
composites
mechanical properties evaluation
ultrasonic guided wave
