Wei Yingying, An Qinglong, Cai Xiaojiang, Chen Ming, Ming Weiwei
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Materials (Basel). 2015 Oct 2;8(10):6738-6751. doi: 10.3390/ma8105336.
The purpose of this article is to investigate the influences of carbon fibers on the fracture mechanism of carbon fibers both in macroscopic view and microscopic view by using single-point flying cutting method. Cutting tools with three different materials were used in this research, namely, PCD (polycrystalline diamond) tool, CVD (chemical vapor deposition) diamond thin film coated carbide tool and uncoated carbide tool. The influence of fiber orientation on the cutting force and fracture topography were analyzed and conclusions were drawn that cutting forces are not affected by cutting speeds but significantly influenced by the fiber orientation. Cutting forces presented smaller values in the fiber orientation of 0/180° and 15/165° but the highest one in 30/150°. The fracture mechanism of carbon fibers was studied in different cutting conditions such as 0° orientation angle, 90° orientation angle, orientation angles along fiber direction, and orientation angles inverse to the fiber direction. In addition, a prediction model on the cutting defects of carbon fiber reinforced plastic was established based on acoustic emission (AE) signals.
本文的目的是通过单点飞刀切割法，从宏观和微观角度研究碳纤维对碳纤维断裂机制的影响。本研究使用了三种不同材料的切削刀具，即聚晶金刚石（PCD）刀具、化学气相沉积（CVD）金刚石薄膜涂层硬质合金刀具和未涂层硬质合金刀具。分析了纤维取向对切削力和断裂形貌的影响，得出切削力不受切削速度影响但受纤维取向显著影响的结论。在0/180°和15/165°纤维取向时切削力较小，而在30/150°时切削力最大。研究了碳纤维在不同切削条件下的断裂机制，如0°取向角、90°取向角、沿纤维方向的取向角和与纤维方向相反的取向角。此外，基于声发射（AE）信号建立了碳纤维增强塑料切削缺陷的预测模型。
