共聚酯无纺布定型-增韧碳纤维复合材料的制备及力学性能

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (4): 53-59.

共聚酯无纺布定型-增韧碳纤维复合材料的制备及力学性能

康少付, 李进^*, 瞿立, 马鹏

宁夏大学,宁夏光伏材料重点实验室,银川750021

收稿日期:2019-07-18 出版日期:2020-04-28 发布日期:2020-04-28
通讯作者: 李进(1964-),女,博士,教授,主要从事先进复合材料及复合材料力学方面的研究,li-jin@163.com。
作者简介:康少付(1982-),男,硕士,讲师,主要从事结构-功能一体化复合材料及复合材料力学方面的研究。本文作者还有周少雄,韩耀璋。
基金资助:
宁夏自然科学基金项目(NZ17259)

PREPARATION AND MECHANICAL PROPERTIES OF TAEKIFYING-TOUGHENING CARBONFIBER COMPOSITES BY COPOLYESTER NON-WOVEN VEILS

KANG Shao-fu, LI Jin^*,QU Li, MA Peng

Key Laboratory of Ningxia for Photovoltaic Materials, Ningxia University, Yinchuan 750021, China

Received:2019-07-18 Online:2020-04-28 Published:2020-04-28

摘要/Abstract

摘要： 针对真空辅助树脂灌注工艺(VARI)成型纤维增强复合材料纤维体积含量较低、厚度难以控制、层间韧性较差的问题,将共聚酯无纺布引入碳纤维织物预成型体中,对其进行真空袋热压定型预处理,最后采用VARI工艺制得了碳纤维/环氧树脂基复合材料层合板。对比研究了共聚酯无纺布改性前后复合材料的厚度变化规律、Ⅰ型层间断裂韧性、短梁剪切性能和三点弯曲性能。结果表明,经共聚酯无纺布改性后层合板的厚度降低,纤维体积含量由改性前的57.9%提高至62.2%,其Ⅰ型层间断裂韧性G_ⅠC值提高了144.7%,短梁剪切强度和弯曲性能基本持平。Ⅰ型层间断裂韧性提升的主要机制:一是层间断裂面之间的纤维桥联作用;二是层间界面处弥散分布的热塑性颗粒阻碍了裂纹的扩展;三是层间的界面相因发生剪切塑性变形而需耗散额外的断裂能量。

关键词: 真空辅助灌注工艺, 共聚酯无纺布, 碳纤维, 复合材料, 纤维体积含量, Ⅰ型层间断裂韧性

Abstract: Aiming at the problems of lower fiber volume content, difficult to control thickness and poorer interlaminar toughness of fiber reinforced composites prepared by Vacuum Assisted Resin Infusion process(VARI), the non-woven copolyesterveils were introduced into the preforms of carbon fiber fabric and then they were pretreated by hot-pressing process in the vacuum bag. Finally, carbon fiber/epoxy composite laminates were prepared by VARI process. The changes of composite thickness, short-beam shear strength, three-point bending behavior and ModeⅠ interlaminar fracture toughness were studied by comparison of the composite laminates before and after modification. The results showed that the thickness of the modified laminate decreased, the fiber volume content increased from 57.9% to 62.2%, the G_ⅠC value of interlaminar fracture toughness increased by 144.7%, and the shear strength and bending performance were basically equal to the unmodified laminate. The significant increase of ModeⅠ interlaminar fracture toughness of the modified composites were mainly based on the following three mechanisms. The first is the fiber bridging between interlaminar fracture surfaces. The second is the dispersion of thermoplastic particles at interlayer interface which hinders the crack propagation. The third is that the interfacial phases need to dissipate additional fracture energy due to shear plastic deformation.

Key words: vacuum assisted resin infusion process, copolyester non-woven veils, carbon fibre, composite, fiber volume content, mode Ⅰ interlaminar fracture toughness

中图分类号:

TB332

康少付, 李进, 瞿立, 马鹏. 共聚酯无纺布定型-增韧碳纤维复合材料的制备及力学性能[J]. 复合材料科学与工程, 2020, 0(4): 53-59.

KANG Shao-fu, LI Jin,QU Li, MA Peng. PREPARATION AND MECHANICAL PROPERTIES OF TAEKIFYING-TOUGHENING CARBONFIBER COMPOSITES BY COPOLYESTER NON-WOVEN VEILS[J]. Composites Science and Engineering, 2020, 0(4): 53-59.

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