性能驱动的连续弯曲纤维增强聚合物复合材料3D打印初步数值研究
Performance-driven 3D printing of continuous curved fibre reinforced polymer composites a preliminary numerical study
摘要：
本文提出了一种新的概念，连续弯曲纤维的碳纤维增强复合材料，这可以实现潜在的添加剂或混合机械制造工艺。基于加载条件，通过有限元分析（FEA）生成主应力轨迹，并用作碳纤维放置路径的指导。三个数值算例，一个开孔单层板在单向拉伸和一个开孔正交铺设层合板在双向拉伸和正常的压力下，进行了研究，并与传统的单向纤维增强复合材料进行比较。模拟结果表明，弯曲纤维铺放可以显著降低纤维和基体中的应力集中，提高CFRP复合材料的刚度。这种性能驱动的优化方法的概念可以为未来纤维增强复合材料的3D打印工艺设计提供有用的工具。
英文摘要：
This paper presents a new concept to place continuous curved fibres for CFRP composites, which can be fulfilled by potential additive or hybrid manufacturing technology. Based on the loading condition, principal stress trajectories are generated through finite element analysis (FEA) and used as the guidance of the placement paths for carbon fibres. Three numerical cases, an open-hole single ply lamina under uniaxial tension and an open-hole cross-ply laminate under biaxial tension and normal pressure, are studied and compared with traditional reinforced composites with unidirectional fibres. The modelling results show that the stress concentration in both fibre and matrix are reduced significantly by the curved fibre placement and the stiffness of CFRP composites have been improved. This concept of performance-driven optimization method could lead to a useful tool for the design of future 3D printing process for fibre reinforced composites.
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