平纹编织碳纤维/Kevlar纤维增强混杂复合材料微-宏观切削去除机理研究

doi:10.3901/JME.2022.21.331

机械工程学报 ›› 2022, Vol. 58 ›› Issue (21): 331-348.doi: 10.3901/JME.2022.21.331

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平纹编织碳纤维/Kevlar纤维增强混杂复合材料微-宏观切削去除机理研究

苏飞¹, 欧阳晨恺¹, 李纯杰¹, 郑雷², 蔡志华¹

1. 湖南科技大学难加工材料高效精密加工湖南省重点实验室湘潭 411201;
2. 盐城工学院机械工程学院盐城 224051

收稿日期:2021-12-03 修回日期:2022-07-10 出版日期:2022-11-05 发布日期:2022-12-23
通讯作者: 苏飞(通信作者),男,1984年出生,博士,副教授,硕士研究生导师。主要研究方向为先进制造工艺与装备。E-mail:sfeihe@163.com
作者简介:欧阳晨恺,男,1998年出生,硕士研究生。主要研究方向为先进制造工艺与装备。E-mail:ouyckhn@163.com
基金资助:
国家自然科学基金（52175400、51805164）、湖南省自然科学基金（2021JJ30263）、江苏省自然科学基金面上（BK20201474）和湖南省教育厅科研（18A182）资助项目。

Micro- and Macro- cutting Mechanism of Carbon/Kevlar Fiber Reinforced Hybrid Plain Woven Composites

SU Fei¹, OUYANG Chenkai¹, LI Chunjie¹, ZHENG Lei², CAI Zhihua¹

1. Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan 411201;
2. School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng 224051

Received:2021-12-03 Revised:2022-07-10 Online:2022-11-05 Published:2022-12-23

摘要/Abstract

摘要： 由于碳纤维和Kevlar纤维力学性能相差迥异，在C-K纤维混杂增强复合材料（Carbon-Kevlar fiber hybrid composite，CKFH）加工中易产生加工缺陷，比单种纤维复合材料的加工缺陷更难控制。由此，从微观和宏观角度，构建CKFH三维有限元切削模型，分析CKFH的切削去除机理及平纹编织结构对切削过程的影响机制。结果表明，在不同纤维取向下，Kevlar纤维均易产生抽丝拉毛现象，尤其当纤维取向θ=0°/180°时最为明显；纤维取向θ=0°/180°时，切屑多为卷曲片状切屑，纤维取向θ=45°、90°、135°时，两种纤维的断裂相互影响，切削表面、切屑形态均与切削方向存在密切关系，当纤维取向θ=45°时，多为细小片状切屑，纤维取向θ=90°时，切屑多为絮状块状切屑，纤维取向θ=135°时，切屑多为成块状切屑；从碳纤维切向Kevlar纤维时，Kevlar纤维出现松散、抽丝拉毛现象明显，从Kevlar纤维切向碳纤维时，在Kevlar纤维的韧性弯曲区碳纤维发生弯曲脆断、碎裂，易出现凹坑；平纹编织结构对切削应力的传递具有明显的阻断作用，有限元仿真结果与试验观测结果基本吻合。

关键词: 混杂纤维增强复合材料, 平纹编织结构, 切削加工机理, 有限元模型

Abstract: Due to the different mechanical properties of carbon fiber and Kevlar fiber, the processing defects are easy to be induced during the machining of Carbon-Kevlar fiber hybrid composites (CKFH). These defects are more difficult to control than the processing defects of the single fiber reinforced plastics. Then, from the micro and macro perspectives, the three-dimensional finite element cutting models of CKFH are established. The cutting removal mechanisms of CKFH and the influence mechanisms of plain woven structure on the cutting process are analyzed. The results show that the Kevlar fibers are easy to be drawn into some filamentous, especially when the fiber orientation θ=0°/180°. When the fiber orientation θ=0°/180°, the form of chips is mostly curly sheet shape. When the fiber orientations θ=45°, 90°, 135°, the two kinds of fiber fracture affect each other, and the cutting surface and chip morphology are closely related to the cutting direction. When the fiber orientation θ=45°, most of the chips are fine flake chips, when the fiber orientation θ=90°, most of the chips are floccule chips, when the fiber orientation θ=135°, most of the chips are lumpy chips. When the cutter cuts the carbon fibers to the Kevlar fibers, the Kevlar fibers appear visibly loose and are drawn into some filamentous. Conversely, when the cutter cuts the Kevlar fibers to the carbon fibers, the carbon fibers in the Kevlar fibers ductile bending zone are brittle and broken by bending. Then, the pit phenomenon is prone to appear. The plain woven structure has an obvious blocking effect on the transfer of cutting stress. The finite element simulation results are basically consistent with the experimental observation results.

Key words: hybrid fiber reinforced composites, plain woven structure, cutting mechanism, finite element model

中图分类号:

TQ327
V258

苏飞, 欧阳晨恺, 李纯杰, 郑雷, 蔡志华. 平纹编织碳纤维/Kevlar纤维增强混杂复合材料微-宏观切削去除机理研究[J]. 机械工程学报, 2022, 58(21): 331-348.

SU Fei, OUYANG Chenkai, LI Chunjie, ZHENG Lei, CAI Zhihua. Micro- and Macro- cutting Mechanism of Carbon/Kevlar Fiber Reinforced Hybrid Plain Woven Composites[J]. Journal of Mechanical Engineering, 2022, 58(21): 331-348.

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平纹编织碳纤维/Kevlar纤维增强混杂复合材料微-宏观切削去除机理研究

Micro- and Macro- cutting Mechanism of Carbon/Kevlar Fiber Reinforced Hybrid Plain Woven Composites

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