不同纤维方向角时碳纤维增强树脂基复合材料切削力建模
作者:
作者单位:

1.天津大学机构理论与装备设计教育部重点实验室,天津 300350;2.上海飞机制造有限公司航空制造技术研究所,上海 201324

作者简介:

秦旭达,1973年出生,博士,教授,研究方向为复合材料加工关键技术。E-mail: qxd@tju.edu.cn

通讯作者:

李士鹏,E-mail:shipengli@tju.edu.cn

基金项目:

国家自然科学基金(51605326);天津市自然科学基金(17JCQNJC04000);国家商用飞机制造工程技术研究中心创新基金(COMAC-SFGS-2018-36794)


Modeling of Cutting Force for Carbon Fiber Reinforced Plastic With Different Fiber Orientation Angle
Author:
Affiliation:

1.Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin University,Tianjin 300350;2.Institute of Aeronautical Manufacturing Technology, Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201324

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    摘要:

    碳纤维增强树脂基复合材料(CFRP)切削中,存在纤维断裂、基体失效和界面相失效等多个过程,且不同纤维切削角时切屑形成机理不同,因而CFRP切削力的有效预测非常困难。对此本文结合最小势能原理和Winkler弹性地基梁理论,基于CFRP代表性单元(RVE),利用其微元求解纤维挠曲变形方程,分别分析了不同纤维方向角时三个切削变形区的力学行为,并完成纤维临界损伤长度的预测,最终形成不同纤维方向角时的CFRP切削力解析模型。通过CFRP直刃铣刀铣削实验,进行了切削力模型的验证,当纤维方向角在0°~180°时,切削力计算值和实验值随纤维方向角的变化趋势相吻合,切削力大小误差在15%以内。切削力随纤维方向角的增大先增后减,分别在90°和45°附近转变变化趋势。切削形貌表明,纤维方向角为135°时,CFRP铣边加工质量较差,临界损伤长度也较大。建立的切削力解析模型可以较为准确地预测CFRP正交切削力,可为CFRP切屑形成中的力学行为分析提供理论指导。

    Abstract:

    The cutting process of carbon fiber reinforced plastic (CFRP) contains the fracture of fibers and cracking failure of resin matrix and interfacial phases.Meanwhile,the chip formation mechanism is diverse from different fiber cutting angle.Thus predicting the cutting force of CFRP effectively has been proven difficult.Combined with the principle of minimum potential energy and winkler elastic foundation beam theory, the deflection equation of fiber is obtained by calculating the microelement based on the representative element of CFRP (RVE) in this paper. The mechanical behavior of three cutting deformation areas with different fiber orientation angle is analyzed ,respectively.The prediction of critical damage length of the fiber is completed, which formed the analytical model of the cutting force of CFRP with different fiber orientation angle.The cutting force model is verified by the milling experiment of CFRP with straight edge milling cutter.When the whole fiber orientation ranges from 0° to 180°, the theoretical value of the cutting force and the experimental data is consistent with the variation trend of fiber orientation angle, and the relative error is within 15%.The cutting force increases first and then decreases with the increase of the fiber orientation angle. Both of them convert variation trend near 90° and 45°,respectively. The cutting morphology shows that when the fiber orientation angle turns 135°, the milling surface quality of CFRP is poor and the critical damage length is tremendous.The established analytical model of cutting force can predict the orthogonal cutting force of CFRP accurately,which can also provide theoretical guidance for the analysis of mechanical behavior in the forming of CFRP chips.

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秦旭达,朱圣富,李士鹏,葛恩德,唐心凯.不同纤维方向角时碳纤维增强树脂基复合材料切削力建模[J].宇航材料工艺,2020,50(6):31-40.

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  • 收稿日期:2020-01-07
  • 最后修改日期:2020-09-06
  • 录用日期:2020-01-08
  • 在线发布日期: 2021-01-15