Abstract Herein, a printing strategy was proposed and expended, which allows fabricating diverse geometries of cellular continuous fiber-reinforced composites (CFRCs) with fiber distribution and interlacement in the cellular structure uniformly. A class of printed triangle-filled cellular structure composites was prepared to present the detail of the printing strategy. The effects of printing and structural parameters on the mechanical properties, as well as shape memory performance of printed CFRCs, were studied precisely, and thereafter, a Finite Element (FE) model was developed on the basis of the printing path to stimulate and analyze the tensile process. Experimental results showed that introducing only 3.8% fiber content into the composite can significantly improve the tensile strength by more than 300%. An increment of cell length was capable of strengthening tensile features compellingly due to changing orientation and alignment degree of fiber in the structure. By contrast, sizing the cell length and embedding further fiber have represented a reverse pattern against the composite's shape recovery ratio, which witnessed an adverse impact on shape-changing materials. A conclusion was given that the mechanical properties and shape memory effect of the 3D-printed continuous fiber-reinforced composite can be optimized by adjusting the geometric parameters and fiber content.

中文翻译：

---

具有新型连续纤维增强打印路径的 4D 打印蜂窝结构复合材料的机械性能和形状记忆效应

摘要 在此，提出并扩展了一种打印策略，该策略允许制造不同几何形状的多孔连续纤维增强复合材料 (CFRC)，纤维在多孔结构中均匀分布和交织。准备了一类打印的三角形填充蜂窝结构复合材料，以展示打印策略的细节。精确研究了印刷和结构参数对印刷 CFRC 的力学性能和形状记忆性能的影响，此后，基于印刷路径建立了有限元 (FE) 模型，以模拟和分析拉伸过程。实验结果表明，仅在复合材料中引入 3.8% 的纤维含量即可显着提高拉伸强度 300% 以上。由于结构中纤维的取向和排列度的变化，单元长度的增加能够显着增强拉伸特征。相比之下，调整单元长度和嵌入更多纤维代表了与复合材料形状恢复率相反的模式，这对变形材料产生了不利影响。结论是通过调整几何参数和纤维含量可以优化3D打印连续纤维增强复合材料的力学性能和形状记忆效应。目睹了对变形材料的不利影响。结论是通过调整几何参数和纤维含量可以优化3D打印连续纤维增强复合材料的力学性能和形状记忆效应。目睹了对变形材料的不利影响。结论是通过调整几何参数和纤维含量可以优化3D打印连续纤维增强复合材料的力学性能和形状记忆效应。