• 材料化学 •

碳纤维三向织物/环氧树脂复合材料的制备与力学性能

1. 1. 中国科学院长春应用化学研究所高分子复合材料工程实验室, 长春 130022
2. 中国空间技术研究院西安分院, 西安 710100
3. 中国科学院长春应用化学研究所高分子物理与化学国家重点实验室, 长春 130022
• 收稿日期:2019-10-09 出版日期:2020-04-10 发布日期:2020-02-21
• 通讯作者: 禹旭敏,邱雪鹏 E-mail:1149886452@qq.com;xp_q@ciac.ac.cn
• 基金资助:
空间微波技术重点实验室稳定支持基金(2018SSFNKLSMT-15)

Preparation and Mechanical Properties of Carbon Fiber Triaxial Woven Fabric/Epoxy Composites †

SHA Di1,3,YU Xumin2,*(),ZHAO Jiang2,MA Xiaofei2,WANG Hanfu1,LIU Fangfang1,QIU Xuepeng1,*()

1. 1. Polymer Composites Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
2. China Academy of Space Technology(Xi’an), Xi’an 710100, China;
3. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
• Received:2019-10-09 Online:2020-04-10 Published:2020-02-21
• Contact: Xumin YU,Xuepeng QIU E-mail:1149886452@qq.com;xp_q@ciac.ac.cn
• Supported by:
Supported by the National Key Laboratory of Science and Technology on Space Microwave, China(2018SSFNKLSMT-15)

Abstract:

The triaxial woven fabric exhibits better mechanical properties than the ordinary fabrics due to its high symmetric weaving structure and good isotropy which can distribute the stress more effectively. In this study, the carbon fiber triaxial woven fabric/epoxy composites with different center distance dimensions between two warp(weft) yarns were prepared by hot press forming technology. The influences of center distance dimensions between two warp(weft) yarns and cutting angles of the specimens on the mechanical properties were studied and demonstrated by comparing with carbon fiber biaxial fabric/epoxy composites. The results show that the fracture strength at 0° decreases from 221.7 to 148.1 MPa and the tearing strength decreases from 1000 to 600 N with the yarn spacing increasing from 2 to 6 mm. Meanwhile, the fracture strength at 90° decreases from 50.0 to 22.1 MPa, the tearing strength decreases from 330 to 100 N and the bursting strength decreases from 424 to 216 N. These reductions in mechanical properties are ascribed to the decrease in the carbon fiber content per area and an increase in the pores of the fabric. The fracture strength of carbon fiber triaxial woven fabric/epoxy composite with a yarn spacing of 2 mm at 0°(based on weft), 30°, 45°, 60° and 90° is 221.7, 48.5, 44.3, 227.7 and 50.0 MPa, respectively. Obviously, the fracture strength at 0° and 60° are much higher than those at 30°, 45°, and 90°. According to the weaving principle of the triaxial woven fabric, the specimens at 0° and 60° are completely identical, so the fracture strength at these two angles is similar. Moreover, specimens at 0° and 60° have a set of yarns parallel to the applied load, which can restrain the deformation damage to a certain extent. However, the three sets of yarns at 30°, 45° and 90° all have a certain angle with the applied load, so the ability to distribute the applied load is weakened. By comparing with the carbon fiber biaxial fabric/epoxy composite, it is found that the comprehensive performances(fracture strength, tearing strength and bursting strength) of carbon fiber triaxial woven fabric/epoxy composite are significantly better. The fracture strength, tearing strength, and bursting strength of the carbon fiber triaxial woven fabric/epoxy composite can reach up to 221.7 MPa, 1000 N, and 424 N, respectively. This study has highlighted the advantages of triaxial woven fabric and laid the foundation for the subsequent preparation of various types of carbon fiber triaxial woven fabric composites and their wide application.