Lu Xiaochun, Zhang Xiameng, Li Yangbo, Shen Yan, Ma Yinqiu, Meng Yongdong
College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China.
Polymers (Basel). 2022 Apr 1;14(7):1440. doi: 10.3390/polym14071440.
Bioinspired composites, capable of tailoring mechanical properties by the strategy of making full use of their advantages and bypassing their drawbacks, are vital for numerous engineering applications such as lightweight ultrahigh-strength, enhanced toughness, improved low-/high- velocity impact resistance, wave filtering, and energy harvesting. Helicoidal composites are examples of them. However, how to optimize the geometric structure to maximize the low-velocity impact resistance of helicoidal composites has been ignored, which is vital to the lightweight and high strength for aerospace, defense, ship, bridge, dam, vessel, and textile industries. Here, we combined experiments and numerical simulations to report the dynamic response of helicoidal composites subjected under low-velocity impact (0-10 m/s). Our helicoidal structures, inspired by the Stomatopod Dactyl club, are fabricated using polylactic acid (PLA) by FFF in a single-phase way. The helicoidal strategy aims to exploit, to a maximum extent, the axial tensile strength of filaments and simultaneously make up the shortage of inter-filament contact strength. We demonstrate experimentally that the low-velocity impact resistance has been enhanced efficiently as the helicoidal angle varies, and that the 15° helicoidal plate is better than others, which has also been confirmed by the numerical simulations. The findings reported here provide a new routine to design composites systems with enhanced impact resistance, offering a method to improve impact performance and expand the application of 3D printing.
受生物启发的复合材料，能够通过充分利用其优点并规避其缺点的策略来定制机械性能，对于众多工程应用至关重要，例如轻质超高强度、增强韧性、提高低/高速抗冲击性、波过滤和能量收集。螺旋复合材料就是其中的例子。然而，如何优化几何结构以最大限度地提高螺旋复合材料的低速抗冲击性一直被忽视，这对于航空航天、国防、船舶、桥梁、大坝、容器和纺织工业的轻量化和高强度至关重要。在此，我们结合实验和数值模拟，报告了螺旋复合材料在低速冲击（0-10米/秒）下的动态响应。我们受口足目动物指节棒启发的螺旋结构是使用聚乳酸（PLA）通过熔融沉积成型以单相方式制造的。螺旋策略旨在最大程度地利用细丝的轴向拉伸强度，同时弥补细丝间接触强度的不足。我们通过实验证明，随着螺旋角的变化，低速抗冲击性得到了有效提高，并且15°螺旋板比其他板更好，这也得到了数值模拟的证实。本文报道的研究结果为设计具有增强抗冲击性的复合材料系统提供了一种新方法，提供了一种提高冲击性能并扩大3D打印应用的方法。
