纺织学报 ›› 2018, Vol. 39 ›› Issue (09): 65-70.doi: 10.13475/j.fzxb.20171010206

• 纺织工程 • 上一篇    下一篇

大尺寸三维编织复合材料结构损伤指数特征

    

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  • 收稿日期:2017-10-30 修回日期:2018-06-07 出版日期:2018-09-15 发布日期:2018-09-12

Damage index characteristics of large-size 3-D braided composites

  • Received:2017-10-30 Revised:2018-06-07 Online:2018-09-15 Published:2018-09-12

摘要:

为实现大尺寸三维编织复合材料内部损伤实时监测,针对三维六向编织复合材料的编织特点,将布拉格光栅(FBG)传感器嵌入三维编织复合材料预制件中,提出了大尺寸智能复合材料的制作方法。研究了大尺寸复合材料内部FBG 传感器的拉伸特性,基于主成分分析方法提出了制件结构损伤检测算法,分析了相同损伤的4 个制件的损伤指数表现特征。试验结果表明:FBG 传感器能准确测量复合材料内部损伤变化;损伤指数可描述试件结构损伤程度。损伤指数T2 和综合损伤指数Phi 能迅速诊断制件内部损伤的存在性,对于制件的同一个损伤Phi 指数计算值大于T2 指数值,是其2 倍以上,Phi 指数可用于及时判断制件内部是否产生损伤,Q 指数和I 指数描述损伤的详细参数更加准确。

关键词: 三维六向编织复合材料, 布拉格光栅, 损伤定位, 综合损伤指数, 应变传感器

Abstract:

In order to study the real-time monitoring of the internal damage of large-size 3-D braided composites, the fiber Bragg gratings (FBG) sensors were embedded in the 3-D braided composite preform according to the braiding characteristics of 3-D six-directional braided composites. Amethod for producing large-size intelligent composite materials was proposed. The tensile characteristics of the FBG sensor inside the composites was studied. Based on the principal component analysis method, the damage detection algorithm of the specimen structure was proposed. The damage index performance characteristics of the four samples with the same damage were analyzed. The experimental results show that the FBG sensor can accurately measure the internal damage of the composite. The damage index can describe the damage degree of the specimen sturcture. The T2 index and Phi index can diagnose the occurrence of internal damage of the specimens more quickly. For the same damage of the sample, the Phi index is calculated to be more than 2 times of the T2 index, and the Phi index can be used to judge whether the interior of the sample is damaged in time. Q  index and I index describe the details of the damage more accurately.

Key words: three-dimensional six-direction braided composite, fiber Bragg grating, damage location, combined damage index, strain sensor

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