Wang Aiqiu, Liu Ying, Yan Rui, Wang Yuye, Luo Pengjun, Li Yangbo
College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China.
Polymers (Basel). 2023 Dec 1;15(23):4599. doi: 10.3390/polym15234599.
Characterized by light weight and high strength, composites are widely used as protective materials in dynamic impact loading under extreme conditions, such as high strain rates. Therefore, based on the excellent tensile properties of continuous fiber and the good flexibility and toughness of the bionic spiral structure, this study uses a multi-material 3D printer to incorporate continuous fiber, and then modifies the G-CODE file to control the printing path to achieve the production of a continuous fiber-reinforced Polylactic Acid composite helicoidal (spiral angle 60°) structure (COF-HP). Dynamic behavior under high-strain-rate impact experiments have been conducted using the Split Hopkinson Pressure Bar (SHPB). Stress-strain curves, impact energy curves and high-speed camera photographs with different strain rates at 680 s-1 and 890 s-1 have been analyzed to explore the dynamic process and illustrate the damage evolution. In addition, some detailed simulation models considering the incorporation of continuous optical fiber (COF) and different strain rates have been established and verified for deeper investigations. The results show that the COF does enhance the impact resistance of the laminates. When the porosity is reduced, the maximum stress of the continuous fiber-reinforced composite material is 4~7% higher than that of the pure PLA material. Our findings here expand the application of COF and provide a new method for designing protective materials, which have broad application prospects in the aerospace and automotive industries.
复合材料具有重量轻、强度高的特点，在高应变率等极端条件下的动态冲击载荷中被广泛用作防护材料。因此，基于连续纤维优异的拉伸性能和仿生螺旋结构良好的柔韧性与韧性，本研究使用多材料3D打印机加入连续纤维，然后修改G-CODE文件以控制打印路径，实现连续纤维增强聚乳酸复合螺旋（螺旋角60°）结构（COF-HP）的生产。使用分离式霍普金森压杆（SHPB）进行了高应变率冲击实验下的动态行为研究。分析了在680 s-1和890 s-1不同应变率下的应力-应变曲线、冲击能量曲线和高速相机照片，以探究动态过程并阐明损伤演化。此外，还建立并验证了一些考虑加入连续光纤（COF）和不同应变率的详细模拟模型，以进行更深入的研究。结果表明，COF确实提高了层压板的抗冲击性。当孔隙率降低时，连续纤维增强复合材料的最大应力比纯PLA材料高4%~7%。我们在此的研究结果扩展了COF的应用，并为防护材料的设计提供了一种新方法，在航空航天和汽车工业中具有广阔的应用前景。
