【摘要】 基于真空辅助树脂传递模塑（VARTM）工艺，采用微米硅粉对玻璃纤维增强聚合物（GFRP）复合材料进行填充改性，探究硅粉质量分数对GFRP弯曲强度、短梁剪切强度和V型缺口梁面内剪切强度的影响规律，并通过扫描电子显微镜（SEM）和动态热机械分析仪（DMA）揭示其增强和耐热性机理。结果表明：当硅粉质量分数为1.0%时，复合材料弯曲强度、短梁剪切强度和面内剪切强度较未改性材料分别提高了22%,23%,17.4%，玻璃化转变温度（T_g）提高了3.8℃；此时硅颗粒在树脂基体中分散较为均匀，与玻璃纤维黏附性较好，起到“机械啮合”作用，有效提升了材料强度。同时，均匀分散的无机粒子可引发裂纹偏转，延缓裂纹扩展及宏观裂纹的产生，从而提高复合材料的韧性。当硅粉质量分数进一步增大时，硅粉颗粒会发生团聚，减弱了纤维/树脂的界面结合，导致复合材料强度不增反降。无机粒子的引入增大了环氧树脂链的交联密度，提高了树脂体系的热容和热导率，进而提高了复合材料的耐热性。更多还原

【Abstract】 This study employs the vacuum-assisted resin transfer molding(VARTM) process to modify glass fiber reinforced polymer(GFRP) using micron-sized silica powder. The influence of silica powder content on the flexural strength, short beam shear strength, and in-plane shear strength of the V-notched beam of GFRP was examined. The enhancement and thermal resistance mechanisms of the modified fiber composites are elucidated through scanning electron microscopy(SEM) and dynamic thermomechanical analyzer(DMA). The results show that at a silica power content of 1%, the flexural strength, short beam shear strength, and in-plane shear strength of the composite increase by 22%, 23% and 17.4%, respectively, compared to the unmodified material, while the glass transition temperature(T_g) rises by 3.8 ℃. At this optimal silica content, the silica particles are well-distributed in the resin matrix and exhibit good adhesion to the glass fibers, facilitating a mechanical interlocking effect that enhances material strength. Additionally, uniformly dispersed inorganic particles promote crack deflection, delay crack propagation, and inhibit the formation of macro-cracks, thus improving the toughness of the composite. However, further increasing the silica power leads to particle agglomeration, which diminished the inerfacial bonding between the fibers and the resin, resulting in a decrease in composite strength. Moreover, the introduction of inorganic particles enhances the crosslinking density of epoxy resin chains, improving the heat capacity and thermal conductivity of the resin system, consequently enhancing the heat resistance of the composite materials.更多还原