内埋光纤L型夹芯复合材料结构渐进失效分析
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摘要
针对内埋光纤L型夹芯复合材料接头结构,通过有限元仿真,研究了内埋光纤夹芯结构的损伤失效问题.建立了含内埋光纤和不含内埋光纤的L型夹芯复合材料接头的三维有限元模型,编制用户子程序进行渐进失效分析.通过与文献中的试验结果进行对比验证了有限元方法的有效性.在此基础上,讨论了含内埋光纤夹芯复合材料结构的损伤失效机制,并研究了内埋光纤形成的树脂富集区的高度对结构损伤失效的影响.结果表明,埋入光纤引起夹芯结构圆弧肘板上面板应力集中系数超过1.10,使面板处的材料提前发生失效,导致夹芯结构强度降低约3%;当树脂富集区高度大于1.5 mm时,埋入光纤对夹芯结构的损伤失效影响增大.
Aiming at the L-shaped sandwich composite joint structure of the embedded optical fiber, the damage and failure problem of the embedded optical fiber sandwich structure was studied through finite element simulation. The three-dimensional finite element models of sandwich structures with and without embedded FBG sensors were established, and the progressive failure analysis was carried out by developing user subroutines. The validity of the finite element method is verified by comparing with the experimental results in the literature. On this basis, the damage and failure mechanism of the sandwich composite structure containing embedded optical fibers was discussed, and the influence of the height of resin enrichment region formed by embedded optical fibers on the damage and failure of the structure was studied. The results show that the embedded optical fiber causes the stress concentration coefficient of the panel on the arc elbow plate of the sandwich structure to exceed 1.10, leading to the premature failure of the material at the panel, resulting in a reduction of the sandwich structure strength by about 3 %. When the height of resin pockets is greater than 1.5 mm, the influence of embedding FBG sensors on the damage and failure of sandwich structures is increased.
Aiming at the L-shaped sandwich composite joint structure of the embedded optical fiber, the damage and failure problem of the embedded optical fiber sandwich structure was studied through finite element simulation. The three-dimensional finite element models of sandwich structures with and without embedded FBG sensors were established, and the progressive failure analysis was carried out by developing user subroutines. The validity of the finite element method is verified by comparing with the experimental results in the literature. On this basis, the damage and failure mechanism of the sandwich composite structure containing embedded optical fibers was discussed, and the influence of the height of resin enrichment region formed by embedded optical fibers on the damage and failure of the structure was studied. The results show that the embedded optical fiber causes the stress concentration coefficient of the panel on the arc elbow plate of the sandwich structure to exceed 1.10, leading to the premature failure of the material at the panel, resulting in a reduction of the sandwich structure strength by about 3 %. When the height of resin pockets is greater than 1.5 mm, the influence of embedding FBG sensors on the damage and failure of sandwich structures is increased.
引文
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[2] 刘刚,张斌,周玉敬,等.内埋光纤光栅碳纤维增强复合材料层压板力学性能及拉伸应变监测[J].玻璃钢/复合材料,2014(7):16-22.
[3] HUANG C Y, TRASK R S, BOND I P. Characterization and analysis of carbon fibre-reinforced polymer composite laminates with embedded circular vasculature[J]. Journal of the Royal Society Interface, 2010(7):12-29.
[4] 纪丕华,曲新业,韦朋余,等.复合材料光纤埋入后拉伸力学性能数值分析方法研究[C].船舶力学学术委员会测试技术学组2016年学术会议,无锡,2016.
[5] HAMOUDA T, SEYAM A F M, PETERS K. Evaluation of the integrity of 3D orthogonal woven composites with embedded polymer optical fibers[J]. Composites Part B, 2015,78:79-85.
[6] KONKA H P, WAHAB M A, LIAN K. On mechanical properties of composite sandwich structures with embedded piezoelectric fiber composite sensors[J]. Journal of Engineering Materials & Technology, 2012,134(1):1-12.
[7] 桂思源.光纤光栅传感器应用于夹芯复合材料接头损伤监测的研究[D].武汉:武汉理工大学,2017.
[8] 冯海心.内埋光纤复合材料层合板力学性能研究[D].南京:南京航空航天大学,2013.
[9] 汪凌云.论纤维增强复合材料的失效准则[J].纤维复合材料,1995(2):1-8.
[10] 严仁军,王奎,赵刚.船用复合材料夹芯板极限强度分析[J].武汉理工大学学报(交通科学与工程版),2017,41(2):208-212.