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Numerical model of unidirectional CFRP in machining: Development of an amended friction model

机译：机械加工单向CFRP的数值模型：修正摩擦模型的发展

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摘要

The difficulty of unidirectional carbon fiber-reinforced polymer (CFRP) machining is one of the main reasons for its limited application. Substantial studies have demonstrated that numerical simulation models can investigate material removal mechanisms from a microscopic perspective to solve machining difficulties. However, most published numerical simulations assumed that the friction coefficient was a constant value, which was true in simplified models, but not completely consistent with reality. To fill this gap, an amended friction model for calculating the tool-CFRP tangential contact was proposed for the numerical model of orthogonal cutting. Simultaneously, an experimental method for establishing friction model was provided, and a verification experiment to prove the correctness of the model was conducted. The results show the following: (i) in tool-CFRP tangential contact, the relationship between the normal force and friction coefficient is nonlinear, and the friction coefficient is not a constant value, (ii) the results of the numerical model with the amended friction model significantly improve in terms of predicted cutting and thrust forces, and chip formation compared with the conventional numerical model, and (iii) two zones of chip formation are discussed (i.e., splash state and accumulation).
机译：单向碳纤维增强聚合物（CFRP）加工的难度是其有限应用的主要原因之一。实质性研究表明，数值模拟模型可以从微观角度调查材料去除机制，以解决加工困难。然而，大多数公开的数值模拟假设摩擦系数是恒定值，这在简化模型中是真实的，但与现实没有完全一致。为了填补这种差距，提出了一种用于计算工具-CFRP切向接触的修改摩擦模型，用于正交切割的数值模型。同时，提供了一种建立摩擦模型的实验方法，进行了证明模型的正确性的验证实验。结果表明：（i）在工具-CFRP切向接触中，法向力和摩擦系数之间的关系是非线性的，并且摩擦系数不是恒定值，（ii）与修正的数值模型的结果摩擦模型在预测的切割和推力方面显着改善，与传统数值模型相比，芯片形成，（iii）讨论了两个芯片形成区域（即，飞溅状态和累积）。

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  • 来源
    《Composite Structures》 |2021年第1期|113075.1-113075.11|共11页
  • 作者

    Xu Jie; Deng Yi; Wang Chenxi; Liang Guiqiang;

  • 作者单位

    Hunan Inst Engn Coll Mech Engn Xiangtan 411100 Peoples R China|Tsinghua Univ Grad Sch Shenzhen Shenzhen 518055 Peoples R China;

    Hunan Inst Engn Coll Mech Engn Xiangtan 411100 Peoples R China|Hunan Engn Res Ctr Composite Molding & Equipment Xiangtan 411100 Peoples R China;

    Xi An Jiao Tong Univ Sch Mech Engn State Key Lab Mfg Syst Engn Xian 710049 Peoples R China;

    Tsinghua Univ Grad Sch Shenzhen Shenzhen 518055 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    UD-CFRP; Orthogonal cutting; Friction model; Finite element method;

    机译：UD-CFRP;正交切割;摩擦模型;有限元方法;

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