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Rapid manufacturing of woven comingled flax/polypropylene composite structures
International Journal of Material Forming ( IF 2.4 ) Pub Date : 2018-12-12 , DOI: 10.1007/s12289-018-01464-1
Imed Derbali , Svetlana Terekhina , Laurent Guillaumat , Pierre Ouagne

The use of natural fibre reinforced composites such as flax fibre / polypropylene is in a constant expansion particularly in automotive and marine industries due to their good mechanical properties, low density and thus, lightness, low environmental impact, low cost, recyclability, renewable properties of flax fibres and a minimum energy intake during their process. One of the major challenges of thermoplastic composites for the automotive industry is to manufacture finished parts in a single processing step within a minimum amount of time. For this purpose, a stamping airflow device was specifically developed. It is designed to produce woven comingled composite parts from comingled woven fabrics such as flax/polypropylene in only 200 s. Firstly, preliminary tests and the optimization of processing parameters were performed. Then, a quasi-static mechanical characterization of the formed parts was realized. By using criteria based on mechanical properties, the optimal process parameters such as the level of pressure, temperature, holding time and cooling rate so that to obtain the lowest voids rate were determined. Finally, a comparison of the mechanical properties of parts obtained from using the new manufacturing process and a conventional thermo-compression process is presented to demonstrate the interest and the level of performance achieved by this original and fast manufacturing device.



中文翻译:

快速制造机织亚麻/聚丙烯复合结构

天然纤维增强复合材料(例如亚麻纤维/聚丙烯)的使用在不断扩展,特别是在汽车和船舶工业中,原因在于它们的良好机械性能,低密度,轻便,对环境的影响小,成本低,可循环利用,可再生的特性。亚麻纤维,并在其加工过程中吸收最少的能量。用于汽车工业的热塑性复合材料的主要挑战之一是在最短的时间内通过单个处理步骤制造成品零件。为此,专门开发了一种冲压气流装置。它设计用于仅用200 s的时间就可以从亚麻/聚丙烯等混合织物生产混合的复合织物零件。首先,进行了初步测试和工艺参数的优化。然后,实现了对成型零件的准静态机械表征。通过使用基于机械性能的标准,确定了最佳工艺参数,例如压力水平,温度,保持时间和冷却速率,以便获得最低的空隙率。最后,对使用新制造工艺和常规热压工艺获得的零件的机械性能进行了比较,以展示这种新颖,快速的制造设备的兴趣和性能水平。

更新日期:2018-12-12
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