Abstract Many unwanted defects such as burr and delamination can be induced due to the high cutting forces in the machining process of carbon/carbon (C/C) composites due to their brittle property. In this regard, it is necessary to predict the cutting force accurately in the machining of C/C composites. In this paper, a prediction model of dynamic cutting force in time domain is proposed for transverse orthogonal cutting of unidirectional C/C (UD-C/C) composites based on the energy method considering the random distribution of fibers and voids. Firstly, a microscopic representative volume element (MRVE) consisting of a single carbon fiber and its surrounding carbon matrix is introduced into this model, and its size varies with the distribution of fibers and voids. Then, the cutting force model of a MRVE is established considering the fiber orientation angle. Second, the representative volume element (RVE) of transverse cross section of UD-C/C composites is simulated mathematically with the random distribution of fibers and voids. The instantaneous resultant cutting force model in time domain is developed by integrating the cutting force of the in-cut MRVEs. The comparison of the predicted and experimental cutting forces shows a good agreement.

中文翻译：

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考虑纤维分布的单向碳/碳复合材料横向正交切割的动态切割力模型

摘要 碳/碳（C/C）复合材料脆性大，在加工过程中切削力大，容易产生毛刺、分层等不良缺陷。对此，在C/C复合材料的加工中需要准确预测切削力。本文基于考虑纤维和空隙随机分布的能量法，提出了一种用于单向C/C（UD-C/C）复合材料横向正交切割的时域动态切割力预测模型。首先，在该模型中引入了由单根碳纤维及其周围碳基体组成的微观代表体积元（MRVE），其尺寸随纤维和空隙的分布而变化。然后，考虑到纤维取向角，建立了MRVE的切削力模型。其次，UD-C/C 复合材料横截面的代表性体积元 (RVE) 用纤维和空隙的随机分布进行数学模拟。时域中的瞬时合成切削力模型是通过对切入式 MRVE 的切削力进行积分来开发的。预测切削力和实验切削力的比较显示出良好的一致性。