玻纤复合材料隔声和力学性能探讨

发布时间：2019-07-09 20:55

【摘要】：随着科学技术的发展,纺织结构复合材料的性能研究不断深入、复合材料成型技术不断提高,纺织结构复合材料的性能不断完善其应用的领域得到不断的拓展,目前纺织结构复合材料被广泛应用于航空、航天、交通运输、建筑、等许多领域。本文旨在通过实验探讨所设计的纺织结构复合材料的隔声和力学性能。本文以玻璃纤维为原料,设计了多种复合材料预成型件的组织结构,经半自动SGA598小样织机设备织造织物,利用真空辅助树脂成型加工工艺将其制备成复合材料,结合缝合技术,利用现有仪器探讨复合材料的隔声和力学性能,研究内容分四个部分:一、在250hz至6300hz频率范围内的同一频率下,借助纤维体积分数来探讨斜纹、加强斜纹、平纹和纬二重复合材料的传递损失,结果表明:从纤维体积分数的角度来看,斜纹、加强斜纹、平纹和纬二重复合材料的隔音性能也呈依次递减趋势。换而言之,体积分数越大,传递损失越大,隔声性能越好。因此,可以从复合材料的体积分数着手,来提高其隔声性能。二、测试缝合后的角联锁复合材料的隔声性能并对其分析,结果表明:无论是对于织物还是复合材料而言,竖缝的效果均好于横缝,但对于无缝合的来说,缝合技术对角联锁复合材料隔声性能的影响没有达到预期的研究效果与价值。即在所研究的频率范围内,缝合技术并没有改善角联锁复合材料的隔声性能。三、采用缝合技术探讨研究其对平纹、斜纹复合材料的力学性能的影响,实践证明:缝合技术使平纹、斜纹复合材料的力学性能得到改善。整体而言,不缝、横缝、竖缝复合材料力学性能呈现依次递增趋势。但就缝合方式来看,竖缝的效果要好于横缝,然而从最大位移来看,缝合后的数值均小于不缝的数值,但相差不大,表明缝合消弱了其弹性和韧性,但削减力度非常小。四、探讨了缝合技术对四层角联锁复合材料力学性能的影响,实验结果表明:横缝、竖缝、不缝的弯曲性能呈现依次递增的趋势,这说明缝合使复合材料弯曲性能下降,这是由于缝合破坏了部分角联锁组织,导致缝合处出现纤维局部劈裂、孔洞现象。从数据来看,虽然整体上缝合后的复合材料弯曲性能稍低于无缝的,但是其韧性却得到了提高和改善。
[Abstract]:With the development of science and technology, the research on the properties of textile structural composites is deepening, the molding technology of textile structure composites is improving, and the application field of textile structural composites is constantly expanded. at present, textile structural composites are widely used in many fields, such as aviation, aerospace, transportation, architecture and so on. The purpose of this paper is to investigate the sound insulation and mechanical properties of the designed textile structure composites through experiments. In this paper, the microstructure of various composite preforms was designed with glass fiber as raw material. The fabric was woven by semi-automatic SGA598 sample looms and made into composite materials by vacuum assisted resin molding technology. combined with stitching technology, the sound insulation and mechanical properties of composites were discussed by using the existing instruments. The research contents are divided into four parts: first, at the same frequency in the frequency range from 250hz to 6300hz, The transfer loss of twill, reinforced twill, plain grain and weft double composites is discussed with the help of fiber volume fraction. The results show that the sound insulation properties of twill, reinforced twill, plain grain and weft double composites also decrease in turn from the point of view of fiber volume fraction. In other words, the larger the volume fraction, the greater the transmission loss, and the better the sound insulation performance. Therefore, the volume fraction of the composite can be used to improve its sound insulation performance. Second, the sound insulation properties of the stitched angular interlocking composites are tested and analyzed. The results show that the effect of vertical seams is better than that of transverse seams for both fabrics and composites, but for those without stitches, the effect of stitching technology on the sound insulation properties of angular interlocking composites has not achieved the expected research effect and value. That is to say, in the frequency range studied, the stitching technology does not improve the sound insulation properties of angular interlocking composites. Thirdly, the effect of suture technology on the mechanical properties of plain and twill composites is studied. The practice proves that the stitching technology improves the mechanical properties of plain and twill composites. On the whole, the mechanical properties of non-slit, transverse joint and vertical seam composites increased in turn. However, as far as the suture mode is concerned, the effect of vertical seam is better than that of transverse seam. However, from the point of view of maximum displacement, the value after suture is smaller than that without seam, but the difference is not great, which indicates that the suture weakens its elasticity and toughness, but the reduction intensity is very small. 4. The effect of suture technology on the mechanical properties of four-layer angular interlocking composites is discussed. the experimental results show that the bending properties of transverse seam, vertical joint and non-seam increase in turn, which indicates that the bending properties of the composite are decreased by stitching, which is due to the partial angular interlocking structure destroyed by suture, which leads to the local split of fiber and the phenomenon of holes in the joint. From the data, although the bending properties of the stitched composites as a whole are slightly lower than those of seamless composites, the toughness of the composites has been improved and improved.
【学位授予单位】：中原工学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

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