树脂基复合材料具有粘弹性，长期在外力作用下会发生蠕变现象，导致复合材料的刚度和强度都发生衰退，致使复合材料结构失去继续承载能力。由于复合材料蠕变研究多集中在拉伸状况下，缺少足够的弯曲蠕变数据，难以进行复合材料结构的可靠性设计。针对玻纤增强乙烯基树脂复合材料进行了弯曲蠕变测试，分析了弯曲蠕变后复合材料试样的力学性能及翘曲变形，并根据时间-挠度曲线探讨了蠕变极限。结果显示，该复合材料在20天左右基本可以达到蠕变平衡，且其蠕变性能优异。%As the viscoelastic nature of fiber reinforced plastic, creep may occur under long term ex-ternal force, then the stiffness and strength of composite structures decrease gradually, and the whole structural system will fail at last. For many years, creep study on fiber reinforced plastic is mainly concerned with tensile behavior, but less research is done on the flexural creep behavior. Because of the insufifciency of storage data, it is dififcult to study the reliability of composites structures in long-term use of lfexure loadings. In this paper, by means of testing lfexural lfexibility change at different times, the lfexural creep behavior by three-point loading of glass if-ber reinforced vinyl ester resins composites is studied. The results show that lfexural delfection changes obviously at the beginning stage of applying lfexural loading, and the change of lfexural delfection is decreased with the prolong of time.
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