对粉煤灰空心微珠/环氧树脂复合材料进行了弯曲试验，研究了微珠粒径、含量以及级配比例对复合材料弯曲性能的影响，并通过弯曲断口微观形貌分析了内在机理。结果表明，空心微珠的加入对粉煤灰空心微珠/环氧树脂复合材料的弯曲强度影响很大。随空心微珠含量的增加，复合材料的弯曲强度呈现先升高后下降的趋势，填充量为15 wt%时，复合材料的弯曲强度最大；随空心微珠粒径的减小，复合材料的弯曲强度随之提高，小粒径微珠对环氧树脂复合材料弯曲强度的提升效果更好；空心微珠级配填充环氧树脂复合材料的弯曲强度主要受级配微珠中小粒径微珠含量的影响，小粒径微珠的比例越大，弯曲强度越高。
By the flexural test of fly ash cenospheres (FACs)/epoxy resin composites,the effect of cenospheres content,particle size and grading ratios on flexural properties of the cenospheres/epoxy resin composites were stud-ied,and the flexural mechanism was analyzed through the flexural fracture morphology.The results show that the addition of cenospheres significantly affects the flexural strength of cenospheres/epoxy composites. With the increase of cenospheres content,the flexural strength of the composites increases first and then decreases and it reaches the maximum when the content of cenospheres is about 15wt%.With the decrease of particle size of the cenospheres,the flexural strength of cenospheres/epoxy composites increases.The smaller size of cenospheres is more benefical to improve the flexural strength of composites.So the flexural strength of composites filled with grading cenospheres is mainly affected by small particle content in grading cenospheres,and with the larger propor-tion of small size cenospheres,the higher flexural strength of cenospheres/epoxy resin composites can be obtained.
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