Sun Qili, Wen Xiaomu, Yin Guangzhong, Jia Zijian, Yang Xiaomei
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
National Key Laboratory of Transient Impact, No.208 Research Institute of China Ordnance Industries, Beijing 102202, China.
Polymers (Basel). 2024 Jun 25;16(13):1789. doi: 10.3390/polym16131789.
In this work, the PEEK/short carbon fiber (CF) composites were prepared, a new thermodynamic coupling (preheating and impact compaction) process of the FDM method is proposed, and the warp deformation mechanism was obtained by finite element simulation analysis. Results show that a new method could improve the forming quality of an FDM sample. The porosity of FDM samples of the PEEK/CF composite gradually decreased from 10.15% to 6.83% with the increase in impact temperature and frequency. However, the interlayer bonding performance was reduced from 16.9 MPa to 8.50 MPa, which was attributed to the influence of the printing layer height change from the printhead to the forming layer. To explain the above phenomenon, a thermodynamic coupling model was established and a relevant mechanism was analyzed to better understand the interlayer mechanical and porosity properties of PEEK/CF composites. The study reported here provides a reference for improving the forming quality of fabricated PEEK/CF composites by FDM.
在这项工作中，制备了聚醚醚酮（PEEK）/短碳纤维（CF）复合材料，提出了一种新的熔融沉积成型（FDM）方法的热力学耦合（预热和冲击压实）工艺，并通过有限元模拟分析得到了翘曲变形机制。结果表明，一种新方法可以提高FDM样品的成型质量。随着冲击温度和频率的增加，PEEK/CF复合材料FDM样品的孔隙率从10.15%逐渐降低到6.83%。然而，层间结合性能从16.9MPa降低到8.50MPa，这归因于打印头到成型层的打印层高变化的影响。为了解释上述现象，建立了热力学耦合模型并分析了相关机制，以更好地理解PEEK/CF复合材料的层间力学和孔隙率特性。本文报道的研究为通过FDM提高制造的PEEK/CF复合材料的成型质量提供了参考。
