ABSTRACT

Continuous fiber reinforced thermoplastic composites (CFRTPCs) with advantages of great mechanical properties and green recyclability, have been widely used in aerospace, transportation, sports and leisure products, etc. This study applied the 3D printing process for the integrated rapid manufacturing of CFRTPCs. The volume fraction and distribution arrangement of fiber reinforcement were designed to evaluate the effect of fiber arrangements on tensile properties of the printed composites. The experimental results proved that some outer and inner defects reduced the surface smoothness and tensile properties based on the analysis of macro and micro morphology. The fiber distributed evenly contributed to the dimensional precision and stability, as well as tensile properties. With the increasing fiber volume, the elastic modulus and ultimate tensile strength both approximately increased while the strain at break decreased. This work promises a significant contribution to the abilities of designing fiber arrangements to control tensile properties of 3D printed CFRTPCs.

摘要

连续纤维增强热塑性复合材料（CFRTPCs）具有良好的力学性能和绿色可回收性等优点，已广泛应用于航空航天、交通运输、体育休闲产品等领域。本研究将3D打印工艺应用于CFRTPCs的集成快速制造。设计了纤维增强材料的体积分数和分布排列，以评估纤维排列对打印复合材料拉伸性能的影响。实验结果表明，在宏观和微观形貌分析的基础上，一些外部和内部缺陷降低了表面光滑度和拉伸性能。纤维分布均匀，有助于尺寸精度和稳定性，以及拉伸性能。随着纤维体积的增加，弹性模量和极限拉伸强度均近似增加，而断裂应变减小。这项工作有望对设计纤维排列以控制 3D 打印 CFRTPC 的拉伸性能的能力做出重大贡献。