Three-dimensional numerical simulation for drilling of 2.5D carbon/carbon composites
Three-dimensional numerical simulation for drilling of 2.5D carbon/carbon composites
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DOI：
10.1007/s00170-017-0653-y
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发表时间：
2017-11-01
影响因子：
3.4
通讯作者：
Zhang, Xu
中科院分区：
文献类型：
--
作者：
Shan, Chenwei;Dang, Jie;Zhang, Xu
碳/碳（C/C）复合材料具有比刚度大、脆性大、各向异性、非均匀性强、导热系数低等特点，加工难度大，易产生撕裂、毛刺、表面质量差、刀具磨损快等问题。准确、快速地预测钻削过程中的推力和缺陷对高质量的C/C复合材料钻削加工具有重要意义。本文提出了一种2.5维C/C复合材料钻削加工的有限元分析方法。基于Shokrieh-Lessard模型和Hashin失效准则，提出了一种改进的损伤起始模型。六种不同的失效模式-X-方向纤维基质拉伸，X-方向纤维基质压缩，Y-方向拉伸，Y-方向压缩，正常拉伸，和正常压缩-分别考虑和建模。提出了一种改进的三维渐进破坏模型，以逼近真实的破坏过程。为了验证的目的，钻孔试验已经进行，并与有限元分析的结果进行比较。实验结果表明，与所提出的模型一致，预测的推力的相对误差为8.07%至13.86%。该模型证明了它的能力，预测推力，材料失效过程中，和损坏的不同值的进给速度。
Drilling of carbon/carbon (C/C) composites is difficult to implement due to the materials' high specific stiffness, brittleness, anisotropic, heterogeneous, and low thermal conductivity, resulting in tear, burr, poor surface quality, and rapid wear of cutters. Accurate and fast predictions of thrust forces and defects are important for C/C composites drilling process with high quality. In this paper, a finite element analysis method for drilling of 2.5D C/C composites is presented. An improved damage initiation model is proposed based on the Shokrieh-Lessard's model and the Hashin's failure criteria. Six different failure modes-X-direction fiber-matrix tension, X-direction fiber-matrix compression, Y-direction tension, Y-direction compression, normal tension, and normal compression-are considered and modeled separately. An improved 3D progressive failure model is developed to approximate real failure process of 2.5D C/C composites. For validation purpose, drilling tests have been performed and compared to the results of finite element analysis. The experimental result shows to be consistent well with the proposed model, yielding a relative difference of predicted thrust force from 8.07 to 13.86%. The model demonstrates its ability to predict thrust force, material failure process, and damage for different values of feedrate.