Numerical investigation of the effects of drill geometry on drilling induced delamination of carbon fiber reinforced composites
Numerical investigation of the effects of drill geometry on drilling induced delamination of carbon fiber reinforced composites
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DOI：
10.1016/j.compstruct.2013.04.026
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发表时间：
2013-11-01
影响因子：
6.3
通讯作者：
Ghassemieh, Elaheh
中科院分区：
文献类型：
--
作者：
Isbilir, Ozden;Ghassemieh, Elaheh
在航空航天工业中，钻孔是制造复合材料层合板组件所需的孔的主要工序。钻削过程仿真是优化钻头几何形状和工艺参数，提高钻孔质量，减少钻头磨损的有效手段。在本研究中，我们建立了钻削碳纤维复合材料的三维有限元模型。考虑了一种基于Hashin理论的三维渐进层内破坏模型。建立了考虑粘结接触区作用的层间脱层模型，该模型考虑了脱层的开始和发展过程。将改进的分层模型与实际钻头几何形状相结合，对不同阶梯比阶梯钻与麻花钻进行了对比分析。采用高阶梯比阶梯钻头后，推力、扭矩和工件应力分布均有所降低。该模型表明，通过选择合适的阶梯钻头几何形状，可以控制分层等缺陷。因此，该三维模型可以作为钻削几何形状的设计工具，以最大限度地减少碳纤维复合材料钻削中的分层。(C)2013爱思唯尔有限公司。保留所有权利。
Drilling is a major process in the manufacturing of holes required for the assemblies of composite laminates in aerospace industry. Simulation of drilling process is an effective method in optimizing the drill geometry and process parameters in order to improve hole quality and to reduce the drill wear. In this research we have developed three-dimensional (3D) FE model for drilling CFRP. A 3D progressive intra-laminar failure model based on the Hashin's theory is considered. Also an inter-laminar delamination model which includes the onset and growth of delamination by using cohesive contact zone is developed. The developed model with inclusion of the improved delamination model and real drill geometry is used to make comparison between the step drill of different stage ratio and twist drill. Thrust force, torque and work piece stress distributions are estimated to decrease by the use of step drill with high stage ratio. The model indicates that delamination and other workpiece defects could be controlled by selection of suitable step drill geometry. Hence the 3D model could be used as a design tool for drill geometry for minimization of delamination in CFRP drilling. (C) 2013 Elsevier Ltd. All rights reserved.