Experimental and numerical studies of process variabilities in biaxial carbon fiber braids
Experimental and numerical studies of process variabilities in biaxial carbon fiber braids
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DOI：
10.1007/s12289-020-01541-4
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发表时间：
2020-01-30
影响因子：
2.4
通讯作者：
Gries, Thomas
中科院分区：
文献类型：
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作者：
Czichos, Ruben;Bareiro, Oscar;Gries, Thomas
本文研究了双轴向碳纤维编织机的制造，以及不同的机器设置对所生产的织物结构变异性的影响。同时，对不同机器设置下的编织过程进行了数值模拟。在这些研究中，纱线张力和加工速度被改变，以产生平均编织角为+/-45度的圆柱形双轴编织。使用各种实验技术，通过编织角、纱线宽度、覆盖系数和纤维损伤的可变性来表征整体预制件质量。此外，还测量了从最终注入的复合材料纱线横截面尺寸的变化。提出了一种利用基于热膨胀和压实模拟的技术将编织过程模拟结果转换为详细的建筑三维有限元模型的方法。这种方法还允许在纱线横截面尺寸中引入实验观察到的可变性。这种模型为纺织复合材料的介观渗透或力学分析提供了一个有价值的起点。实验结果与数值模拟结果的比较表明，该过程模拟能够很好地再现不同机器配置下的真实编织角，并能很好地再现真实的纺织结构。
This paper investigates the manufacture of biaxial carbon fiber braids and the influence that different machine settings have on variability of the textile architecture produced. In parallel, numerical simulations of the braiding process with these different machine settings have been conducted. For these studies yarn tension and process speed are varied to generate cylindrical biaxial braids with an average braid angle of +/- 45 degrees. The overall preform quality is characterized by means of variability in braid angle, yarn width, cover factor and fiber damage, using a variety of experimental techniques. Furthermore, from the final infused composite variations in yarn cross-section dimensions have been measured. A method is presented to transfer braid process simulation results to a detailed three dimensional finite element model of the architecture using a technique based on thermal expansion and compaction simulation. This method also allows the possibility to introduce experimentally observed variability in yarn cross-section dimensions. Such a model provides a valuable starting point for mesoscopic infusion or mechanical analysis of the textile composite. A comparison between experimental and numerical results shows that the process simulation can well reproduce the real braid angles in terms of mean value and scatter under different machine configurations and that the meso-scale textile model gives a good reproduction of the true textile architecture.