基于结构化增韧的新型织物织造及复合材料力学性能研究

发布时间：2018-07-02 20:10

  本文选题：复合材料 + 毛圈织物　； 参考：《天津工业大学》2017年硕士论文

【摘要】：织物增强树脂基复合材料因其轻质高强等优良的力学性能在各个领域都得到了广泛的应用,但受到外来冲击时会在复合材料层间产生分层损伤,造成对材料使用寿命的限制,让抑制分层、提高复合材料断裂韧性成为该领域研究的重点问题。本文基于层间增韧思想,设计并织造一种新型织物——毛圈和毛绒织物作为增强材料。毛圈和毛绒织物增强复合材料是一种新型的机织复合材料,它利用织物表面形成的特殊结构——Z向毛圈和毛绒,经过层压后在中层间与树脂基体形成协同作用的增韧层,提高了复合材料层间断裂韧性及抗冲击能力。其主要研究内容如下:针对毛圈和毛绒织物的压缩性能进行了研究,发现毛圈和毛绒织物压缩后因织物表面的毛圈和毛绒在层间会形成具有孔隙的层间区域,导致毛圈和毛绒织物的可压缩性劣于平纹织物,最终引起纤维体积含量的降低。通过VARI工艺制备复合材料层合板,研究了毛圈和毛绒织物增强复合材料层合板的基本力学性能,包括:拉伸、压缩、弯曲及剪切性能。研究结果表明:由于复合材料层板纤维体积含量的降低,导致其拉伸强度、压缩强度及弯曲强度均有不同程度的降低,而剪切强度没有因纤维体积含量的降低而降低。因层间毛圈和毛绒结构与树脂综合作用的结果,导致剪切强度有1.43%-25.22%的上升,由此可见毛圈和毛绒结构对层板层间力学性能作用显著。通过进行Ⅰ型、Ⅱ型层间断裂韧性以及冲击后剩余压缩强度试验研究了复合材料的断裂韧性及抗冲击性能。结果表明:毛圈和毛绒结构的引入可有效提高层合板的断裂韧性及承载能力,且毛绒结构优于毛圈结构。8号毛绒织物(毛绒为尼龙)增强的复合材料相比未增韧的9号试样,G1。增幅为87.07%;6号毛绒织物(毛绒为玻璃纤维)增强的复合材料,GⅡc增幅为34.62%。毛圈和毛绒结构能够有效提高复合材料的抗冲击性能,4号试样(毛圈织物增强)的CAI增幅为26.70%,5号试样(毛绒织物增强)的CAI增幅为28.89%。
[Abstract]:Fabric reinforced resin matrix composites have been widely used in various fields because of their excellent mechanical properties such as light weight and high strength. However, when subjected to external impact, delamination damage will occur between the composite layers, resulting in the limitation of the service life of the materials. Reducing delamination and improving the fracture toughness of composites are the key problems in this field. Based on the idea of interlaminar toughening, a new type of fabric, woolen fabric and plush fabric, is designed and woven in this paper. Wool circle and wool fabric reinforced composite is a new type of woven composite material. It utilizes the special structure formed on the fabric surface Z direction wool circle and plush, after lamination, it forms the toughening layer of synergistic effect between the interlayer and the resin matrix. The interlaminar fracture toughness and impact resistance of the composites were improved. The main research contents are as follows: the compression properties of woolen and plush fabrics are studied. It is found that the interlaminar area with pores is formed between the wool circles and wool fabrics due to the compressing of woolen and plush fabrics. The compressibility of woolen and woolen fabrics is inferior to that of plain fabrics, resulting in the reduction of fiber volume content. Composite laminates were prepared by Vari process. The basic mechanical properties of laminated laminates reinforced by wool and plush fabrics were studied, including tensile, compression, bending and shear properties. The results show that the tensile strength, compression strength and flexural strength of laminated composite laminates decrease in varying degrees due to the decrease of fiber volume content, but the shear strength does not decrease because of the decrease of fiber volume content. The shear strength increased by 1.43% to 25.22% due to the combined effect of interlaminar wool and plush structure with resin. It can be seen that the effect of wool circle and plush structure on the interlaminar mechanical properties is remarkable. The fracture toughness and impact resistance of the composites were studied by means of the fracture toughness and residual compressive strength of mode 鈪，

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