三维编织玻璃纤维/环氧树脂复合材料薄壁管轴向压缩性能的温度效应

Temperature effect on axial compressive properties of three-dimensional glass fiber/epoxy resin braided composite thin-walled tubes

  • 摘要: 通过三维编织成型技术与树脂传递模塑工艺(RTM)制备了15°、25°、35° 3种编织角三维编织玻璃纤维/环氧树脂复合材料薄壁管,分别在低温(−100℃、−50℃)、室温(20℃)和高温(80℃、110℃、140℃、170℃)环境下对三维编织复合材料薄壁管进行轴向准静态压缩性能测试,基于X射线微计算机显微断层扫描技术(显微CT)研究了温度和编织角对三维编织玻璃纤维/环氧树脂复合材料薄壁管轴向压缩性能和损伤形态的影响。结果表明:三维编织玻璃纤维/环氧树脂复合材料薄壁管准静态压缩性能具有显著的温度效应。温度越高,增强体与基体的结合越弱,编织复合材料薄壁管的压缩强度、压缩模量与比吸收能越低。随着温度的升高,编织复合材料薄壁管的破坏模式发生从局部剪切失效到纤维束-基体界面大面积脱粘的改变。编织角对三维编织复合材料薄壁管的压缩强度、压缩模量及比能量吸收均有不同程度影响,小编织角编织复合材料薄壁管沿编织纱线方向的取向更高,能承受更大的轴向载荷,因此抗压缩性能更好。

     

    Abstract: Three-dimensional (3D) braided glass fiber/epoxy resin composite thin-walled tubes with three braiding angles of 15°, 25°, and 35° were prepared by 3D braiding molding technology and resin transfer molding process (RTM). The quasi-static compression performance test of 3D braided composite thin-walled tubes was carried out at low temperature (−100℃, −50℃), normal temperature (20℃) and high temperature field (80°C, 110°C, 140°C and 170°C). The effects of temperature and braiding angle on compression properties and compression failure pattern of 3D braided composite thin-walled tubes were studied based on X-ray micro-computer tomography (Micro-CT). The results show that the quasi-static compression behavior of 3D braided composite thin-walled tubes has a significant temperature effect. As the temperature increases, the failure mode of the braided composite thin-walled tubes changes from local shear failure to large-area debonding of the fiber tows-matrix interface. The braiding angle has different effects on the compressive strength, compressive modulus and specific energy absorption of 3D braided composite thin-walled tubes. The braided composite thin-walled tubes with small braiding angle have a higher orientation along the braided yarn direction which can withstand greater axial compounding, so the compression performance is better.

     

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