CAJ | 학술논문

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。
수지기복합재료구유점탄성，장기재외력작용하회발생연변현상，도치복합재료적강도화강도도발생쇠퇴，치사복합재료결구실거계속승재능력。유우복합재료연변연구다집중재랍신상황하，결소족구적만곡연변수거，난이진행복합재료결구적가고성설계。침대파섬증강을희기수지복합재료진행료만곡연변측시，분석료만곡연변후복합재료시양적역학성능급교곡변형，병근거시간-뇨도곡선탐토료연변겁한。결과현시，해복합재료재20천좌우기본가이체도연변평형，차기연변성능우이。
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.