摘要
连续纤维3D打印技术结合了复合材料高力学性能和3D打印灵活制造的优点,具有较大发展潜力。然而现有工艺制得的零件存在较多成型缺陷,影响了该技术的大规模应用。本文基于自行研制的3D打印设备制造芳纶纤维增强PLA试验件,研究试验件成型质量并提出了滑移缺陷发生条件,系统研究了纤维束滑移、剥离、断裂和层间孔隙等缺陷,最后提出优化打印速度、路径变化角、冷却系统和喷嘴外形四种工艺优化方法,设计了相关试验进行验证。结果表明,优化打印速度、路径变化角和增设冷却系统可将纤维束滑移距离分别降低45%、81%和50%,优化喷嘴设计可将纤维束断裂率降低90%。本研究为基于3D打印的复合材料设计和制造提供了新的思路和解决方案。
Continuous fiber 3D printing technology combines the advantages of high mechanical properties of composite materials and flexible manufacturing of 3D printing,which has great development potential.However,there are some forming defects in the parts produced by the existing process,which affect the large-scale application of this technology.By using self-developed 3D printing equipment,aramid fiber reinforced PLA test parts were manufactured.The molding quality of the test parts was studied and the conditions for slip defects were proposed.The defects of fiber bundle slip,peeling,fracture and interlayer pores were systematically studied.Four process optimization methods such as the printing speed,path angle,cooling system and nozzle shape were proposed and relevant experiments were designed for verification.The results show that optimizing velocity,path angle and cooling system can reduce the slip distance of fiber bundle by 45%,81%and 50%,respectively,and optimizing nozzle shape can reduce the fracture rate by 90%.The research provides ideas and solution for the design and manufacture of composite materials based on 3D printing.
作者
孟云聪
周光明
蔡登安
张楠
MENG Yuncong;ZHOU Guangming;CAI Deng’an;ZHANG Nan(State Key Laboratory of Mechanics and Control of Mechanical Structure,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《复合材料科学与工程》
CAS
北大核心
2024年第1期98-104,共7页
Composites Science and Engineering
关键词
3D打印
连续纤维
缺陷
优化方法
复合材料
3D printing
continuous fiber
defects
optimization method
composites
